I had a Studio Cutter, but it was more than I needed and took up a lot of space. I have an electric Go now.
As far as dies go, strips are good. I have recently become a fan of the half square triangle blocks. I like the tumbler die, I like the smaller squares for cutting up scraps. I don't use any of the specialty shapes, but that's just me. I am eager to try the log cabin die but haven't yet. Same with the hunter's star block.
I used the flannel raggedy die for the Go in the Studio. It went okay, but it wasn't my favorite.
Hope this helps somewhat, these are just thoughts off the top of my head!