How well does the Ag Leader steer it? I think that's what it comes down to. If you can get it tuned to be perfect then go for it. Seems like sometimes the third party steering systems don't quite have the performance that the integrated stuff does, whatever the brand might be. 

If you go to a pull type, you could run implement guidance and not worry as much about what the tractor is doing. But I don't think ag leader does imp guidance themselves