Felt is on its way out and will probably be banned within a few years in MN and WI. As others have mentioned, several states have already banned it for fishing.
I’ve had Aquastealth rubber soles with ceramic studs on a pair of Simms wading boots for years. They are almost as good as felt with studs, but the have the added advantage of not collecting snow the way felt soles do when used for winter fishing.
Whatever you get, studs are a worthwhile addition. If the boots don’t come with them, just add your own using hex-head sheet metal screws. I found some stainless steel ones somewhere, which are fantastic and never wear out.
Grouse