I want to get either a PHENOM or PHENOMizm as my next throw, but I can’t decide which would be better for me. I didn’t see a PHENOM at AZ the last time I was there, but I did see a PHENOMizm, so I can really only try out one of them. What are the differences in terms of sleep time, balance, etc? Any and all help making this decision is greatly appreciated. 
phenom and phenomizm are the most balanced yoyos i know of, so you can’t go wrong with any of them.
what i can say is if you can afford the phenom, go for it, if you can’t, the phenomizm won’t disappoint.
From what I see, the PHENOMizm is a cheaper and more affordable version of the PHENOM. If it fits your budget, I would recommend that you get the PHENOM, as all-metal yoyos generally have less vibe and are more durable than those with plastic in them. If you have a limited budget, then I think you should go with the PHENOMizm. It also plays quite well, as both yoyos generally have the same design.
Phenom plays and feels heavier to me. I love the both though and own each one!
I also own both. Phenom is just amazing. Its my go to thro for the last 2 weeks since I got it. But the Phenomizm is my pocket throw.
If you play 1 without having the other to compare it to right away. The IZM feels heavier to me. Slight Vibe but nothing that would be a concern.
But if you switch to the Phenom right after the IZM. You instantly feel just how smooth aand better play it has. I played the IZm for a week without realy playing the Phenom simply becaue I wasn’t home to play it. But as soon as I grabbed the phenom it was night and day on the feel of it.
I wanted it since it released but the pricetag steered me away as I was just a YYJ. But after biting the bullet and getting it the only thing I regret was judging YYJ and waiting.
So I think what I’m gonna do is this: if I’m buying it myself, I’ll get the PHENOMizm. If my parents are buying it for me as a graduation present, I’ll get the PHENOM.
Well the Phenomizm is a cheaper version of the Phenom. Phenomzim is a bi-metal but both have great balance, spin, smoothness etc.
Phenom is 2 times as expensive as the Phenomizm but I don’t think it plays 2 times better. Phenomizm even if you are willing to pay for Phenom. Phenom is also pretty heaving with those gold rings on.