I prefer ASCII because there is too much in the other tilesets that are unaccounted for.
I don’t like not knowing what a bunch of pink “no” signs are supposed to represent. That in and of itself gets annoying, if not outright deadly because I can’t tell that a skeletal dog is homing in on me. Also at the moment it seems that most tilesets don’t get the balance quite right for things like grass vs dirt. It’s either all green, or all dirt and then something that looks like bushes but it isn’t a bush so I I’m leading enemies onto grass tiles instead of bushes. Also vehicles are awkward if not outright unviewable at times in tilesets.
While I understand that things like vehicles and enemies take time to draw and get right, a tileset that doesn’t overcome these issues makes the game unplayable for me. So I just use ASCII for now.
Edit:
I am trying the other tiles sets again for the experimental, so maybe my mind will change on this. I thin Tsu’s tile set is the most promising at the moment.