I haven't shot either extensively but I would question both as being ideal for a younger hunter. I can only shoot a few rounds before I feel myself concentrating on recoil or straining rather than placing the shot accurately. After shooting about a box worth of rounds both are out of the fun category for me.

As for hunting they are both excellent for everywhere there is not a caliber restriction. I would think more on the lines of a starter rifle for your son and then the 300 or 338 for yourself.
I would also think about something in the .260-30/06 range paired with a .375 but that would be two rifles.

The single all around rifle is a myth to me, if you hunt extensively then you will probably end up with more than one sooner or later.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli