Just returned from a 10 days vacation, and I've thinked to write down my personal buffet chart (all of them already visited in previous trip excepted Wicked Spoon, first visit).
Please note that in my opinion these are the some of the best options in Vegas, so the last standing is still a good option.
Here we go:
#5 Rio. Probably quality is not the best, but there is a huge choice and I always pay a visit.
Mexican corner, asian corner, american and italian corner, all with lots of options. Only here you can find some fried plates like different kinds of fish and others. Settings sure are the worst among the five, so as desserts
# 4 Wynn. It used to be my favourite, but for some reason I've increased my disappointment in last visits.
Nothing changes, never a new dish, not a wide choices as others.
Dessert are still the best or close to, settings (especially in the main lobby) very nice. But it lacks of a WOW factor
#3 Sterling Brunch. Quality is sure the best, but options, especially for hot plates, are very small. I think 2 or 3 main courses, no more
Only here you can find lobster, caviar, filet mignon, oysters, perrier jouet, with an outstanding service and setting.
Dessert used to be better, price (as you may know) is very steeper than other (more than double the price)
#2 Bellagio. Maybe friday (and saturday) is better than other days, sure I love the variety of options and quality.
Everything is fine, meat, fish, wide and tasty options of pasta (I'm italian, and I can assure they have the best pasta of all buffets), great desserts, and I love those quails, I think I ate 5 or 6!!!
#1 Wicked Spoon @Cosmopolitan.
Hands down, my new favourite.
When I started walking around I thinked "Finally something new in a buffet!". It's not the fact many dishes come in pre-settled portions (I'm used to take really small amount, smaller than they have, then eventually have a second trip), but the fact they have different options from other buffets.
Quality is really good, some dishes were really tasty (I loved gratin potatoes with truffles!!!), and choice was really wide.
Setting is fine, desserts are very good as eye-candy, a bit worse than expected when tasted.
Anyway, a really good buffet. My only complain I tried it on my last day, so I couldn't repeat.
Hope this could help