Well, I have the Prophet 8, which is the predecessor of the Rev2 and a Sub37. Partially I would agree and disagree …
AFAIK the Rev2 has almost the same synth engine as the Prophet 8, it has 2 DCOs and Curtis chips for filters, giving us 12dB/Oct or 24db/Oct LP. IMO the filters are great for many bread and butter sounds, but they lack a particular personality, if I compare them to filters from Moog, Oberheim, or even other Dave Smith synths.
If we compare the monophonic features only …
The advantage of the P8/Rev2 is definitely the 4 LFOs, 3 envelopes (1 can loop), and a very flexible modulation routing … great for all kinds of moving pads and atmospheres … but that would be a particular polyphonic task …
The Sub37 uses VCOs and a Moog ladder filter with 24/18/12/6 db/Oct. It has two very versatile envelopes, which go to audio-rates and can loop, and it has two LFOs. The modulation busses are versatile. IMO the Sub37 is a synth, which is a big sweet spot by its own right.
It’s maybe not fair to copmare this, but switch on the P8/Rev2 and listen to the inital patch. Well it’s something, which is not bad, very clean, and we have to tweak many knobs to get to a great sound. Switch on a Sub37, it’s Moog, warm and rich, just so. IMO this is advantage and disadvantage at the same time. If we love Moog, we are already there, if we want something non-Moog-ish, bad luck.
For monophonic sounds I like the Sub37 much more than the P8, because for me it has more personality. But this might be different for others …