i think the spice market is the best of the CZR buffets!
and, if you're using the buffet pass, there is no surcharge. and, in my opinion, the food is much hotter (temperature-wise) at the spice market than bacchanal.
hey, look, i don't want to dissuade you from trying bacchanal; it is indeed an experience. but the fact that you have to make a 10 PM curtain (not at caesars) worries me. vegas traffic, by foot or taxi, can be problematic and you'd have to leave caesars by 9 PM at the latest, which wouldn't allow for a leisurely dining experience, in my opinion. and if you run into even the smallest bottleneck at bacchanal, things might slow down considerably. and the food, while good, is marred by the poor experience you're likely to have there.
as you noted, though, on a tuesday night, it could be more manageable. even so, i'd choose another night or an afternoon. let us know what you thought, if you do try it.
as always, YMMV.