depends on the last and welt. grant, plaza, leydon, Aberdeen with a flat welt/leather sole regardless of color are dress boots to me. by dress I mean wear with trim suit or slacks.
Barrie/trubalance/modified (beo, cant send pms with my phone for some reason) are lasts for casual wear. would not wear with a business suit.
This really depends on a persons body type and shape. Sleeker looking lasts on someone with a heavy frame looks unbalanced and out of proportion. I think the Barrie last can work nicely for a heavier/larger person with a suit or slacks.
The Barrie is a wonderful compromise between shape, comfort and style. My two cents.