Are you reffering specifically to the new RE sub, Stroker, or in general?

 

keeping everything fair equal power input... and same box you would really need to see the rest of the theile small for each sub to determine which would be louder... in this world if it was strictly based on xmax... the one with more would be louder... but that depends if the coils of the woofer will be thermally capable of handling that much power that it would take to make a sub move that far...and would the motor structure and suspension be strong enough to control the cone at that much excursion... how much power, how big of a box would you need and how low would you need to tune it to make it move 5" peak to peak.... answers = ALOT + HUGE + LOW