In reply to Kemics:
Other potential problems with a system board:
- you need to know what your weaknesses are and be a good problem setter to reap maximum benefits
- less variety and space limitations mean less technique training
System board is somewhere between bouldering and a fingerboard.
It is probably better to supplement bouldering with system board training rather than replace it.
Another approach is to structure the bouldering sessions.
By varying the types and difficulty of problems, angle, hold size, number of moves and rest times, you can introduce strength sessions, power sessions, aerobic and anaerobic endurance sessions and train your weak points. You can choose to concentrate on crimpy, reachy, powerful or technical problems. As some problems are already set, there is less demand on your own setting skills, but you can still set your own problems like on a system board. On top of that you can add training periodization.
The answer is also dependent on the quality and quantity of problems/circuits at your bouldering wall.
Unfortunately if you do any type of highly structured training you risk boredom. You need a lot of motivation. This can come from your future goals, but it's good if you like the struggle of training itself.