If you search the technical forum, you'll find a lot of people's opinions on this. I don't think social discussion is the right forum. Perhaps a moderator can move this topic?
However...
Personally, I love my sock poi the best. Mine are squishy beanbags in yellow/black striped knee socks. Playing with them feels like spinning bees!
I have tail/comet poi, too, but I feel limited by what I can do with them. I personally can't seem to hyperloop with them, and the tails whip my face when I buzzsaw. It makes me to cry. Might just be my personal ineptude, of course. And I'll admit: when the tails don't tangle, they are indeed pretty.
My answer: gets lots and lots of different toys! Play with them all at different times!