Rainbow Islands or Macross 2036?

Hi guys.

Right. I'm going to buy a new PCE game and I've found a place with Macross
2036 and Rainbow Islands. Which is the most valuable and which am I
most/least likely to find again? I only want to buy one at the moment
They're pretty expensive but way less than what I've seen them go for
before.
Also wondering about a game I just bought. Managed to get a brand new sealed
Formation Soccer 95. It's really cool, but I was wondering if anyone knew
what enhancements having an Arcade Card adds to this game? It's a hybrid
Arcade/Super CD and I'm just using it as a super CD at the moment.

Thanks

Kris