My favorite is usually whichever one I got most recently. Right now it's the 15" Pen Knife with walnut handle.
My favorite in terms of beauty is the Chitlangi Bowie and its big brother, the Giant Chitlangi Bowie. It's all I can do to swing the 55oz GCB even once, but anything in the path of that swing is in big trouble. Not a practical knife, but if I ever need to behead a water buffalo this will be my go-to blade.
My favorite among the smaller khukuris is a 15" 16oz Chitlangi by Lokendra. Immaculate craftsmanship and a very practical size.
My favorite among the mid-sized khukuris is an 18" 28oz Manakamana Special by Rajkumar. Perfect in every way. Truly "special."
My favorite amng the least expensive khukuris is a 16" 23oz Ugly Villager by Arjun. It's not really ugly, and it has one of the most comfortable handles of all, and great balance.
The one I would pick up first for most tasks is the Ugly Villager. It can do almost anything and I don't have to worry about marring the finish, since there is none.
-- Dave