Kelley, check seatguru.com On there you can see each configuration for each planetype of a lot of aircarriers. With you in a wc, you won't be allowed to seat in the row in front of the (emergency) exits. Normally those are the closest to the bathrooms. Bulkhead seats tend to be very close also, but again; all depends on the specific plane configuration.
Why do you worry about this? Did you know there is something called an isle-chair? It's a sort of wheelchair that fits right in the isle. While you can't (nor are allowed to) get around on it yourself or have somebody in your party push it, the FA's will be happy to give you a push to and from the bathroom.
Another thing; there are smaller and bigger bathrooms. (allthough not on each plane). You booking a seat "close to the bathroom" could mean you being close to the small bathroom which could be a no-helper if you need the bigger one. (Just to give you some insight; I actually prefer the smaller one. I can stand to make the transfer and find the smaller bathroom to give me more space to lean into while doing that, without having to really reach. This is also very welcome in case of some turbulance right at the moment I'm standing. I'll never stand "free", I'll allways fully lean into a wall. It's saved me from numerous turbulance fallings.
When flying, I always do bulkhead seats. They have the risk of running into a baby bassinet (on intercontinental flights), but they're easier to deal with for me than standard chairs. Having a chair in front of me is a big risk of dislocating something due to the chair moving at unexpected moments, so I don't want to go that way and neither will an airline if they don't want to run the risk of diverting the plane. Having the wall in front of me is another wall for me that I can lean into while transferring without hurting myself to much (leaning down on things like armrests hurt) and secure my grip a bit in case of turbulance.
Also bulkheadseats give more space for the legs, which again saves me dislocations. I always take an aisle-seat. While this has the risk of someone bumping into you, I can regulate that better than having people sitting on both of my sides during the whole flight bumping into me. (somehow they allways seem less understanding about risks of bumping into me than FA's and people that only have to deal with you for a couple of minutes) The aisle-seat has the second benefit of not having to climb over somebody if you have to use the bathroom. I could get them to get out of their chairs for me, but I tend to do night-flights so I hate to have to do that. The good thing is that almost allways the person sitting next to me understands that crawling over me to get out of their seats causes me more distress than an "averegde" person so they never go past me, but past the other 2 persons on the other side to get out.
Another thing you'll want to check at seatguru.com is which seats have foldable armrests. Not all do and if you need those to transfer you'll love knowing which rows and which seats do have them.
So it really depends on what your needs are, which are good seats to travel in when having a disability. For somebody using a wc, not needing foldable armrests to transfer into the seat and no added medical needs any chair will do. Sure one chair is better than the other (more space, quieter place) or worse (backrest not able to recline), but everybody has to deal with that anyway.