There are to many factors to say which way is better. Example say you have Dual 2ohm woofers 6 of them, you want to run 2 amps, 1 amp per 3 that gives you a 1.34ohm load (before rise) but another amp in the mix and that gives you 2 subs per amp at a 0.5ohm load (before rise) so majority of the time the 3 amps at 0.5 are going to be loudest, because you have more power (if you can support 3 amps wired at 0.5) then you would have at 1amp 1.34ohm. Make sense? We cant depict whats better its more of testing in your application.