I think Pym wins a solid majority with prep. Sinister should win the straight match with TP as I don't think Pym carries tp blockers as standard equipment.
I've always wondered if Pym's size changing effected his brainwaves on any level. Like, say if he shrinks sub-atomic size or so, is his mental presence still as detectable as someone else?
With Prep and without the celestial engine I say Pym wins. Standard encounter I cant say. Sinister has the edge because of telepathy but Pym has that tool kit with him that he keeps in the subatomic universe.