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 VMP TVS l JLT123 l O/R X l 28x11.50Rx15 M/T Street R's l BMR Suspension l Recaros
03 Sonic Blue 3.8 / 17 Magnetic Fusion Sport 2.7 EB