I've been playing 45 days now and I'm torn.
- Pluto is helpful with getting items for Daisy and Minnie.
- Parachute Drop helps get the ears for Sarge which can be a little bit of a pain without Parachute Drop
- RC Racers helps get the ears for Hamm and the brown hats for Pete, but after the update the brown hats are easy to get through character missions
- I've seen some people mention using gems on the parade. I think using 5 gems to add a second float is good, but personally I do not think the parade pays out well enough to spend any more gems on the parade than that.
- Rex really doesn't help that much with getting items. His only real bonus is helping shorten the time to defeat Zorg
- I'm having a hard time welcoming Eve without getting Wall-E so i'm considering getting Wall-E once I have 475 gems because even after welcoming Eve it will really help to have a second option for getting Eve's ears.