I'd say for the money spent long tubes are the best choice.
As for the brand it really depends on budget...you can pick up a set of BBK ceramics for ~600 or step up to Kooks or Hookers for well over 1k.
The power gains will be more noticeable with long tubes vs shorties.
Are you running straight pipe in place of your cats or a mid pipe?
12 Black GT500 SVT PP l 2.6 Pulley/Idler l Airaid l o/r X l 305 NT555R's l Recaros l
04 Azure Blue Mach 1 / 03 Sonic Blue 3.8 / 14 Sterling Grey F150 FX4 402A 5.0 / 11 GT500 R.I.P.