As several people have pointed out, you really just have to try different things and see what works best for you.
In my own personal experience, I usually train each bodypart once a week for awhile (usually several months.)After that, I switch to training each part more often, i.e. Big Boy Basics, or ABBH. When I started this, I noticed the gains really picked up, and as they finally leveled off, I switched back to once a week and the gains started again. This keeps it fresh for me, so I don’t start dreading hitting the gym.
And of course diet can make a big difference also. It’s probably the most important factor affecting your recovery ability. Well, diet and rest, but these tend to be overlooked so often when they really can be the deciding factors for how often and with what intensity you can train, and what kinds of gains you can make.
Sorry the post is kind of long, hope it makes a little sense.