Generally, as far as Isolations go Outside Isolation refers to the Offensive Player (outside threat so generally either a Guard or SF) who can get the most buckets and/or output for his team. It'd be highly advised to have this guy with a ton of DR/HA/JS/IS with possibly a little bit of PA to pass out to an open man. Offense still needs a couple of other players to be able to run effectively.
Inside Isolation is the opposite, though with a Big Man who is very skilled. A big man with great IS and some PA is lethal.
I've had more time playing with Inside Iso. throughout my time and it helps to have jump shooters who can knock down jumpers/threes around a big man with good IS/PA so he can either dunk it down low or pass it out to the shooter. More known as a "Hub".
I'd recommend Inside Iso. if he has that Passing so it can feature him more and maybe add shooters if you don't have those.
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