Chevy2
I don't have your car in the Gonkulator database ie gears, exhaust, weight etc so I just grabbed a 255cid from Tom Lowe's old dyno series & shoved your cams in there. 255cid, Clifford intake, headers, lumps/ported head, 9.45cr.
Isky
Torq 285 at 4300
Powr 294 at 5900
Best at 2-advance or 107i 111e
Crane
Torq 285 at 4200
Powr 286 at 5800
Best at 1-advance or 111i 113e
In other words, "about the same" so it's down to, which do you have lifters for, whats your lift limit, car specifics, etc.
And are you ready to turn 6000 or else they are both too big
