I like HeartCatch, it´s a pretty good show (as a matter of fact i wrote a pretty extensive article
about it ), its just that it bothers me a little that HeartCatch is getting all the attention when it comes to Figuarts.
Suite might have had a few issues, but i enjoyed the show for the most. I really likes the design of the outfits and i think they would make great Figuarts, especially Hibiki (Cure Melody), she might be the pinkiest pink Cure ever but she Rocks. Hard.
As for Smile, it is a fun season but a lot of people don´t like it and i can see why. The show is fun and the characters are entertaining, but there is little focus on the actual story so the show is not as engaging as other seasons. It has some really cool moments, like episode 23 and 32, but the rest is mostly filler, the GOOD kind of filler but filler nonetheless.
I admit that the Smile Cures would make some great figuarts, but we will have to wait for an announcement on that because right now the Figuarts Precure line seems to be solely focused on HeartCatch.