I agree. There are further differences: 2.5in vs M.2 (more pricey), SATA vs NVME (pricer), NVME 3.0 vs 4.0 (pricier), and certain products of a brand are alot more expensive even if the same interface and capacity is used.Today most SSDs are well grouped into ranges. Eg 1TB is between 110 and 140 Eur and saving 10 Eur on questionable manufacturer is under big question.
Also what matters a lot is warranty. Difference between 3 and 5 years is 10 - 20 Eur. Think 5 years worth few Eur more.
Also, DO NOT trust manufacturers and their numbers. There are a lot of sites with benchmarks showing real results. Copying huge files is not real example!
But most important: Google before buy to see what others say!
Question - My laptop requires M.2 2280 SSD. None of the units listed indicated they were 2280 SSDs. Or are they?