I'm late here but thought I would post anyway. You are asking for opinions so...
I have both. Both premiums. You didn't say which version you were considering. Both games are definitely better in the premium/le versions. Big differences from pro to premium. JP more than DP though.
I sold my WOZECLE. Absolutely gorgeous game, but it wasn't as exciting or as fun as others I have.
Having said that, I would sell WOZ and buy both JP and DP Premiums. Both are a LOT more fun IMO.
Now if I had to keep just one it would be JP.