I prefer ASCII except that:
-Monsters have health bars in tiled mode, giving you a bit more information about their HP.
-Herb status can be identified in ASCII without herbalism.
-Certain monsters of similar types are clearly distinguishable (eg. blink dog vs hyena).
I'd like to switch back and forth, but that requires you to play in NotEye mode all the time, even if you aren't using tiles, which I find quite sluggish (esp., say, missile/spell animations).
Hoping to win with every class, doomed. Archer, Barbarian, Bard, Beastfighter, Druid, Elementalist, Farmer, Fighter, Monk, and ULE Priest down.