Soyuz U vs Proton-M Briz-M
Side-by-side comparison across specs, pricing, and overall score — every value traced to a source.
Verdict: Soyuz U ranks highest overall (#2) with a score of 69.8.
The best choice still depends on which specs matter for your workload — per-metric winners are marked below.
What the numbers hide
Computed from the published values below — no estimates, no generated claims.
Fragile verdict
The overall winner flips to Soyuz U if Successful Launches is weighted at 55% (it counts for 31% today). If successful launches drives your decision, the ranking above may not be your ranking.
Real tradeoff
Soyuz U clearly beats Proton-M Briz-M on Successful Launches but clearly loses on LEO Capacity — this pair is a priorities question, not a quality question.
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| Metric | Soyuz URussian Federal Space Agency (ROSCOSMOS) | Proton-M Briz-MKhrunichev State Research and Production Space Center |
|---|---|---|
| Overall OptiSift Score | 69.8#2 | 58.2#4 |
| LEO Capacity | 6,900 | 21,000 |
| Successful Launches | 694 | 62 |
| Failed Launches | 20 | 6 |
| Launch Mass | 313 | 712 |
| Length | 51.1 | 53 |
| Diameter | 2.95 | 7.4 |
| Reusable | No | No |