I've played all of them to some degree (though only a small amount of SMRPG).
My favourite would be Superstar Saga for GBA. It's hands-down the most HILARIOUS game I've ever played, the bros. attacks are cool, and the fighting system is my favourite of any RPG ever.
Then it goes:
2. Paper Mario
3. SMRPG
4. Partners in Time
5. SPM (Found it quite dull, actually)







