I'll usually try out several different reverb units on each project to find the right one. For the tom reverb on ZOP I actually used the D-Verb plugin within PT.
I really don't have one patch or unit that I use all the time. To be honest, depending on where I'm mixing, a particular unit might already be in use in another room, or out being repaired etc. At that point you have to have a Plan B or even a Plan C. As a result, you can end up using different units and different patches.
For both the Nile and the Akercocke, I did use a 480L for the tom reverb. As with any drum reverb unit, I modify the patches according to how the drum sounds "hit" the reverb. Some patches that I've used over the years include "A Plate", "Snare Plate" and "Small and Bright", but if you spend a little time you can actually make all of those sound virtually identical. Therefore, I select the patch according to the sound of the toms (same with the snare as well etc.) once I've got the EQ pretty close. Then I modify both the patch and the drums accordingly after that. It's very seldom that a factory preset will work without any fine tuning, but the presets are a good starting point and can be tweaked from there.
For the last few years quite a few of my reverbs have been generated within PT, even when I'm not mixing completely ITB. I enjoy doing it that way, simply because I can then recall all the reverbs and delays exactly, and the third dimension is often one the most time-consuming things to set up or re-create. Quite often, for some mixing projects, I find that I haven't got enough "old reliable" outboard reverb units, so I'll use others from within PT as well. I remember doing a mix years ago at a studio I'd never worked at before, and they had a couple of units out of commission, so I ended up using only ITB reverb. It worked out great.