I'd say it's a bit like the 5'8 vs 5'10 dom/spitfire issue.... you can use both, but the bigger one will go better in smaller surf. In the beginning the 5'4 SP felt a bit floaty for me, but I only noticed it when sitting on it and duck-diving it. It does not feel too big when surfing it. And after using it I now don't have a problem with the volume at all, I'd rather have that little extra float in the typically the small summer stuff. But then again I haven't tried the 5'2 and can't compare them.... I'm happy with the 5'4, but I'm quite sure I could use the 5'2 if the intention was to use it in a bit better waves. I've used the 5'4 in knee high small mushy stuff and up to shoulder high waves that I normally would use my Alternator or Spitfire in, and it goes great in both.
Conclusion(?): the 5'4 will go great in small, mushy and better waves: safe bet. While the 5'2 might be the one if the intention is to use it only in waves that have slightly more punch in them...
- Are you planning to keep the Spitfire or is the Potato going to replace it (or maybe another board is to replace the spit)?
Here's my 5'4 :)
The sides of the tailpad is from some leftover bits I had from another tailpad. Wish I didn't spread the tailpad out that much, but I didn't plan to make the pieces on the sides until after applying the pad.