Do you guys find it easier to execute combos with a fightstick opposed to the Ps3 controllers?
Would you recommend using a fightstick on characters that aren't combo centric like Sackboy?
One thing you should know about fight stick support in this game is that it is very broken. Many users have reported that their fight stick/pad has a specific problem: L2 and R2 buttons don't function at all. SuperBot claims that this isn't a problem with all fight sticks, but quite a few do have this problem. All other buttons work fine, but just know that you'll be playing with 2 buttons less than other people who aren't using fight sticks.
Check out this thread for a list of fight sticks that have been reported to have this problem.
But back on topic. If you're talking about specific characters then yes, a fight stick can definitely help. One character that you'll definitely have an easier time using with a fight stick is Heihachi. Dante's also another character that could benefit from a fight stick; cancelling and changing direction mid combo is just much quicker with a fight stick.
Other characters don't really benefit that much from fight sticks, but it definitely won't hurt if you've used sticks for other fighters.
I use Kat and Heihachi at times so that's great. Some of my mains don't really require timing like Sir Dan and Sweet Tooth but I'll try it out anyways