Seafood buffet, for a little over $40.
The layout was somewhat confusing, but once you figured it out, you were able to have the advantage over the folks who hadn't yet....dropping your line-time considerably.
The snow crab was all I went for, and boy did I load up. Unfortunately the crab was rather flavorless. Unlimited mimosas, made up for this.
My wife had a little more adventurous time at the smorgasbord. She like the prime rib especially, but said everything she are was decent. She attacked the dessert bar, and came back with a stack of mini-sweets. From cheesecake to crème brûlée, she loved them all.
As far as "best in Vegas", I'm not sure. I think the Orleans might just beat out Studio B. However, if you drink alcohol, Studio B is the buffet for you!