People love using Saturn controllers for fighters. That USB version looks pretty cheap, so I think it's a good start.

If you want to go to tournaments and events, you'll need something that works on PS3/PS4. You might be able to get away with some sort of adapter, or you can buy a native pad like the Hori Fighting Commander 4. However, I think you should spend some time with the game before you spend more than $20 or $30 on a controller.

There are two versions on Amazon ( both literally named hori fighting commandar 4)

https://www.amazon.com/Fighting-Commander-PlayStation-Officially-Licensed-4/dp/B01GVOFIAA

https://www.amazon.com/HORI-Fighting-Commander-Controller-PlayStation-4/dp/B00TKLFES8

Is there a difference?

Also i heard octa has problems, is that true? Because hori 4 is quite difficult to come by.

My big fingers chew through d-pads like a beaver.

I wouldn't recommend buying a stick if you've never used one before. It will take you a while to get truly comfortable with it. I would suggest either sticking it out on your controller, or invest in a Fight Pad

If you want a fightpad, then Hori Fighting Commander: amazon link

Or you could get try grabbing the older model, Fighting commander 4: amazon link