I think this thread can speak for itself:
Lots of other cool polys out there, but the TI series still qualifies as a Forever Poly in 2022. I just traded my TI2 kbd for a TI1 desktop last year and couldn’t be happier.
Edit: between the P5 and T5, I’m not sure what I’d pick. But from a cost perspective, any synth amortized over 10 years is pretty cheap, and you probably have at least 10-20 years, maybe a lot more if you are in good shape, of jamming left in you.