Here's a few belts I have;
top to bottom
Daltech Force Bullbelt, it's new
Beltman, well used, everyday carry
The Amish belt from hanks, every day work belt, a few months old
Dickies belt I used for work
L to R Dickies, Amish, BM, Daltech
T to B Dickies, Amish, BM, Daltech
The Amish belt would be fine for IWB carry but is not very stiff, single piece of leather. Roller buckle, has 8 holes and the edges aren't finished all that well. You can see the natural color of the leather in some places. You can replace the buckle.
The Beltman has served me well, it works well with IWB and my leather OWB holsters. It's two pieces of bull hide stitched together. The stitches are just slightly raised and has 5 holes. It was a quick ship belt. I carry a Third gen. S&W and some times a 1911. Both pistol IWB and OWB. You can replace the buckle.
The Daltech is the stiffest belt. Two pieces of bull hide stitch together but the stitches are raised some what. It will work great for IWB carry but is so thick that my leather OWB holster holes would be a pain to thread the belt through. Seven holes and has a nice satin finish, good looking belt. You can replace the buckle.
IMHO FWIW