PJ is lol 2015. I'd go with monker but would get something like Jnandez' course on it too, not that much use just flapping around in it yourself

abacus or calculator??? tough choice

Well you have to consider what form of training you want. If u wanna get a quick REview of hands while understanding ranges better and how they interact etc i think PJ is just the best way.
If you are very advanced in your approach and want to get a better feel for equilibrium strategies and how to build more balanced strategies than u prolly wanna check out a solver.

Hope you have a big budget as Monker requires a subscription to cloud computing service to run every sim.

No it doesn't

Both, and only buy monker if you understand it.

Should I buy a power saw or a machine gun?

Wait, why are there so many holes in that tree?