I have both BPs, I like the 5" the best, but the 3.75" works fine as well. If your worried about nicking something with the side of the BP go with the 3.75".
I believe that Danase is the only place with the 5" LC CCS. AG has slightly larger ones 5.5" roughly. Danase CCS 5" are better IMO.
Another good thing about the 3.75" BP is that you can switch from 5" to 4" and vice-versa.