I'm currently going through the same decision of choosing between Gemini and Induction. Through some (mostly unvalidated) reaserch i've found that, while most folks (arguably correctly) disucss the pros/cons of the rims with Gemini and Induction. The actual tire is not cosidered or discussed.
The Gemini 19″ Model Y tires are the
Continental ProContact RX. On the TireRack site they only get a user recommendation of just
3.8 out of 10. The Induction 20″ Model Y tires are the
Goodyear Eagle F1 Asymmetric All-Season. On the TireRack site they get a user recommendation of
7.8 out of 10.
With weighing this in, i'm surely going the induction route. My 2 cents, hope this helps someone.