I have a Fehrman designed by Doc Ron Hood. It's a great knife, coated 3V, very light, thin handle with removable scales.. Less fast but extraordinarily tough, Busse Steelheart II and Natural Outlaw are my favourite hard users, but not really suitable for much kitchen work. There are thinner Busses. Infi is great stuff.
Can't comment on the Siberts, almost bought one for the double edge and/or serrations, which most folks don't like, but I can't see them displacing the Fehrman or the Busses.
I guess it depends on your hand size and personal preference because these are really outstanding knives. But you will need a second knife for small work. I always wear a small knife when I'm on the land or water.