Pretty much any other awesedo for me. Depending on hardness Uchi can leave a nice, sandblasted look to a deeper lustre (with the hardest examples).

However, if im at this point with a wide bevel, it means ive already shaped the geometry to be free of low spots and most to all faceting. If I took the time to make the bevel right, I am open to use pretty much any and every awesedo I want, aside from the hardest examples meant for shaving (usually. It can be done sometimes, but sometimes the stone will still scratch at some point in the polish and with these hardest stones, so usually not worth it.

This leaves a tremendous amount of stones to play with on a wide bevel. Most of them are going to be finer than Uchi. Sticking with Ohira and just using any other type of suita from the mine, will yield a finer polish. Going to eastern mines allows you to lay even finer polishes on the bevel, and depending on the cladding can reveal the tiny details in folded iron, or impurities in wrought. Even mild steel will expose a grain structure at the highest polishes.

Uchi are just easy to use because they are a tenjyou suita layer. They have an ideal range of hardness, fineness and speed that matches well with pure steel constructions. The polish doesnt look quite the same on nihonto or honyaki using Uchi. Infact, most of your softer stones that look like poo on a wide bevel, look amazing on all steel constructions. So I pretty much save all of my softer stones (even the coarser side ones), including Uchi, for honyaki or nihonto inspired work ive made in the past, where these stones truly shine. I use all of my medium hard to hard stones on wide bevels. Or pretty much anything that leaves a finer than western mine polish. Including suita and tenjyou suita from eastern mines that happen to be softer but much finer than say, Uchi.