Do not confuse the best for the cheapest.
**Cheapest **option is to find the Mad Catz Fight Pad USED at a game store, thrift store, pawn shop or yard sale.
Most Reasonable option (in my mind) is to find a NEW Mad Catz Fight Pad
Easiest option is the PS360+. Not that the PS360+ is bad mind you, it is the most expensive of the options.
Best option is subjective. It depends on your skill set the size of your budget and the reliability of the parts involved.
If you know how to solder and you are confidant in your abilities, I say go the Fight Pad route. Mainly that once you done that successively, later down the road if you have the same issue again you know exactly what to do and have all your options open.
Boards come and go, know-how stays with you. If this is your first time, it be a learning experience but you be better prep.
What ever route you go, it be completely up to you.