I'm also well aware that I'm late to the party, but yes, my favorite DSI/Sequential synth is prophet12 and PRO2 - the most powerful synth that Dave has ever created as he said when p12 was launched, and still is in my opinion.
Like evolver and its sister models, the prophet12/PRO2 synthesis is digital analog hybrid. Uncle Dave has packed everything he had in his hands to create these models. They literally are full blown modular synths smashed into compact keyboard format. Great sounds too, naturally what you expect from DSI/Sequential.
But then again, what people demanded to him was prophet-5 reissue. Hence, after evolver-series he had to create full analog synths like prophet '08, all the mophos, and tetras. Then again, after prophet12/PRO2 he had to create full analog synths complete with VCO like prophet-6, OB-6, and finally the prophet-5 Rev4. History repeats itself.
Don't get me wrong, I had a prophet-5 Rev3 before, and I loved it so much. It finally broke, and I had to give it to a friend, but it was such an awesome synth that no matter how you tweak it, no matter what the knob positions are, they always sounded great. Indeed, the prophet-5 is a real vintage masterpiece, needless to mention. I also love OB-6, fabulous sounds.
That being said, if I had enough money to buy a p5 Rev4, then I still hunt for finding a prophet12. Or maybe look for different kinds, for instance moog one, Waldorf Quantum, or John Bowen Solaris. I know pretty well what I'll do with a p5 already, but haven't fully explored my own sonic universe with a p12 or other models.
I still love reading the preface of owner's manuals for prophet12 and PRO2. It's filled with message from uncle Dave saying "You gotta keep movin' forward". Yes I fully agree, and I will.
Thanks.