I have them both. The reasons people are giving you are ridiculous. Both have bronze rings - but the placement has little to do with the play of the yoyo. Whether the rings are on the putside or halfway up the rim is a matter of design.
The Phenomizm has rings half-way up the inner wall because it has very little rim weight. The midway rings take the place of rim-weight. That makes the rims (plastic) very thin on the outside edge vs. the Speeder 2 which [places its weight on the outside with very thick bronze rings.
In my humble opinion - both play incredibly well. Both have great spin-times and both are very nimble on the string. They both are comparable to any metal that I own in performance and spin-time. The BIG and I mean BIG difference is the comfort of each. The Phenomizm and the Phenom have razor edged rims. That means that on binds - those edges will speed into your hand like a knife. Not a problem until the 50’th bind, or so. The trade-off is that the Phenomizm is as zippy and precise as they get; while still being made of plastic.
So, if you want an awesome comfortable, high performance yoyo for $45 - get the Speeder. If you want a not so comfortable, awesome, high performance yoyo for $65 - get the Phenomizm.
I think the $20 difference makes this one a no-brainer. Now the trick is finding one…