I started throwing RHBH and got to a point where I was thowing 250 consistently. I then tried RHFH for those right turning shots. I got decent distance (not as far as backhand), but I must have been doing something wrong because my arm would hurt a lot after just a few throws. Therefore, I started throwing LHBH and I actually got almost the same distance as RHBH, except my accuracy was a little off.
Now, I usually throw RHBH and only use LHBH when I need it. I rarely use RHFH, but if I need a tight fit going right, I can usually pull it off. Although, I have done LHFH once (it was seriously my only shot wedged between a small tree and a bush) and it went about 70 ft to about 10 ft from the basket.
I believe that backhand has to do more with gettting your body into it as per what CWAlbino said and forehand has more to do with arm speed and strength. I am now hitting 280-300 ft consistently with a few drives spilling into 350 ft and it will probably get much better with more time. With forehand, I am getting 250 ft on a great throw. I have extremely powerful legs (was squatting 450+ lbs. when I was lifting for football) and a powerful chest, but my arm speed and strength are lacking. Therefore, I can tranfer that power into the disc, but I need to increase my arm attributes to get those 400+ drives.
I will still continue to work my forehand game with both arms in practice fields because I think it is cool to have RHBH, LHBH, RHFH, LHFH and the overhead throws (tomahawk and thumber with right hand of course) in your arsenal. I just need to figure out how to throw more forehand shots without hurting my arm so quickly.