It sounds good, then you try and get a TER (regional train) and find there is one or two a day, using old rolling stock, overcrowded for an exorbitant price.
So if you want to take a TGV to/from Paris, it is nice. Anything else, less so (try looking at fast train route from Lyon to Bordeaux - through Paris)
Unless I misunderstand, AWS SnapStart and their memory snapshots are the same feature (taking memory snapshots to speed up cold start). It doesn't seem a fair comparison to ignore this and my assumption is because AWS Lambda SnapStart is faster.
So if you want to take a TGV to/from Paris, it is nice. Anything else, less so (try looking at fast train route from Lyon to Bordeaux - through Paris)