I think all of these are actually equally reliable with
proper tuning and equipment.
It all stems from when you want the power and what your goals are. If you like the seat of the pants fast a JRSC at 8psi will do the trick perfectly because the power is always there. If you want more control over boost and/or possibly running higher bost levels then obviously a turbo is the way to go...
As far as the DRAG 3 and the RevHard Stage 2... its pretty similar main componet wise... the manifolds are different and I really have not heard much about the DRAG kit but the revhard ones can crack... I have heard of it several times.
Good luck.