Start by separating block from object storage
Block storage appears as a disk mounted inside an instance, while object storage appears as buckets reached over an API. The two are priced, limited and backed up differently, so a listing that blends them into one number is hard to judge. Aruba names both object and block, which tells you one vendor can cover either job without a migration later.
UCloud's listing does not break storage types out, so block capacity stays an open question there until you confirm it with the vendor. Object access matters as well, and Aruba's object layer is S3-compatible, so existing tools and libraries carry over unchanged. If your workload is object-shaped rather than disk-shaped, weigh the Block storage rankings before you commit to a volume.
Price per gigabyte, and the span around it
Storage is billed per gigabyte per month, so the per-unit figure is the line that scales with your data. Aruba lists €0.011 per GB per month. Across the listings held in our comparison, the recorded span for that field is €0 to €207 per GB per month, so a single provider can sit far below the pack while another sits above it.
Two cautions on that headline number. First, confirm what is being quoted: some listings price object storage, some price block, and a low object rate says little about a mounted volume. Second, per-gigabyte storage is only one part of the bill. Write the per-gigabyte figure and the egress figure for each candidate on the same line, then compare. The Vultr review shows how the same field is worded by a different vendor.
Egress fees decide whether a cheap disk is actually cheap
Egress is the quietest cost in block storage, and it is where strong storage rates get erased. Aruba charges €0.05 per GB, and the recorded span for that field is €0 to €0.22 per GB. A per-gigabyte storage price that looks excellent can be cancelled out by a handful of large restores when the egress rate sits at the top of that span.
Included allowances change the arithmetic more often than discounts do. Aruba includes 40 TB per month with the entry package and 40,000 on its entry package, so a workload that stays inside that allowance pays nothing to move data out. Model your own monthly transfer against the allowance first, then price only the overflow against the per-GB rate.
Bundled disk and entry plans
Entry plans often bundle a small disk with compute, and that bundle hides the true per-GB rate. Aruba's entry plan is 1 vCPU, 1 GB RAM, 20 GB storage at €1.99, billed monthly. UCloud's entry plan is 1 vCPU, 1 GB RAM, 40 GB system disk at $5.34, also billed monthly.
Read those two lines as one test: how much disk do you get for the least outlay, and will that disk hold your operating system, logs and backups. A larger bundled disk at a higher entry price can still be the cheaper route if you would otherwise buy storage on top of a smaller bundle. For other pairings, the UpCloud review and the Kamatera review are useful checks on the same fields.
Billing granularity and bandwidth allowances
Billing period matters most when usage is spiky. UCloud's billing granularity is hourly and its model list reads hourly, so short jobs can start and stop without committing to a full month. Aruba's entry pricing is billed monthly, which suits steady state rather than bursts.
Bandwidth allowances decide whether a capable disk is usable in practice. UCloud's package includes 200 GB/month data package, 30 Mbps peak bandwidth, while Aruba's allowance is 2 TB/month. Compare the allowance against the throughput your workload actually needs, because a disk that outruns the network reads no faster than the network carries it.
Footprint, compliance and support
Where the storage sits and who answers when it fails both belong in the comparison. Aruba runs 7 regions, is headquartered in IT and operates as Aruba S.p.A.. UCloud lists 28 locations, is headquartered in HK and operates as UCLOUD INFORMATION TECHNOLOGY(HK) LIMITED.
Compliance sets overlap heavily, so look for the entries a shared tenant would not hold. Aruba lists ISO 27001, ISO 9001 and ISO 14001 and UCloud lists CMMI Level 5, ISO 9001 and ISO 27001. Both run Linux and Windows, shown as linux and windows and linux and windows, and Aruba supports you through phone, email and help centre. The Aruba review and the UCloud review expand on each of these.
Capability signals worth checking early
Some claims are easy to confirm and worth confirming before a migration. UCloud pairs its accelerator fleet with an RDMA interconnect carrying GPUDirect RDMA and InfiniBand support, which matters when storage feeds machine learning pipelines. It also offers an OpenAI-compatible API, managed engines for MySQL, PostgreSQL and MongoDB, and the control plane at no charge.
UCloud also offers $5 credit on contacting support after linking a credit card to accounts that contact support, with hosts from $0.96 per node. On the other side, Aruba's compute spans vps and bare metal and is aimed at workloads such as game server and forex. Use the Akamai Cloud (Linode) review as a reference point before you sign.
A short scoring sheet
Score every candidate in the same order: storage type coverage, price per GB per month, egress rate and free allowance, bundled disk at the entry price, bandwidth allowance, region footprint, compliance set, support channels. Fill the same row for each provider from the Block storage rankings, then read the differences out loud.
Where a field is missing, leave it blank and put the question to the vendor rather than assuming a value. A disk that looks cheap on one line and expensive on egress is the classic block storage surprise, and it only surfaces if you score both lines together.