Guess I'll throw in my 2 cents since I have both species right now...
The Blue Rams I have are wild caught and the largest ones yet are slightly over 1 1/2". My largest male Bolivian (I have 3 pairs...) I close to four inches long! The Bolivian rams are very peaceful, never showing any aggression towards anything unless they are trying to spawn. The Blue rams on the other hand, are very much territorial and will show aggression towards anything that comes near... even my Plecos! With both in the same 30 gallon tank, the Blue rams definitely bully the much larger Bolivians and you can tell the Bolivians are stressed out because of their color. Since my Bolivians should about be ready to spawn again, I'm getting ready to separate them and give each their own tank.
IMO and IME, if you want to breed them, then the Bolivians are much easier to breed, but I'd suggest you not put the two in the same tank for breeding. I think the Blue would stress the Bolivians out too much and my experience shows that if the Bolivians get stressed, then they eat their eggs.
Good luck... too bad you are not closer, in another month my remaining Bolivian fry from the last spawn should about be ready to go to new homes!
Bill C.