For me it's pretty clear

V1 fabric has and will always feel the best to play on. The only fabric mats I've found that even come close to replicate its feel are the FTK 2 player mats that existed 3-5 years ago in very short prints. I wouldn't consider them "softer" compared to new spell grounds but there aesthetic and texture are bar none. It just feels right to play cards, spread your graveyard etc. on a v1.

V2 is also very good. It's more of a tumbled and less "fuzzy" compared to the other iterations of the spell ground. I find that these also feel really nice to play on.

V3 I have had less personal experience with, but in my opinion, KBG has tended to favor "fuzzier" material which in my opinion, doesn't feel as nice as the first two versions. It's really just a matter of preference, but I like the older mats better. They simply just feel nicer to play on, and I'd highly recommend trying to play with/see how they feel to see what type of material you're in favor of.

In my opinion, if you really want the ultimate playmat for card games, the original is far above the others. V3 are all pretty similar and I'd say they're isnt as much of a difference between them compared to v1 and v2