One more dinner in Vegas
Really a very easy answer. While Wing Lei is a good restaurant, it is now way even in the same quality domain as Sinatra. I have eaten at both and while I like WL I would go there once for every 10 times I dine @ Sinatra. HOWEVER, if you are in the mood for Asian inspired dining then obviously WL is your choice. Baring that, Sinatra is it. Their food is really quite good and borders on fantastic. While some may say it is too simplistic or the choices are limited, I believe it executes its Italian fare as good as any other Italian restaurant in Las Vegas.
3131 Las Vegas Blvd S, Las Vegas, NV 89109