This has a lot to do with it, I imagine. I’d say don’t overthink it. If you know what you like, go with that because when you sit down to make something, that’s going to always be the shortest distance to get you to something you’re happy with.
Poly-wise, I tend to go back and forth between Micromonsta 2, Prophet 12, Peak, and Super 6 desktops. And most of the patches I end up with could be done on any of them, given enough time. They all sound great and have oodles of mod slots, it’s just some get you to certain places faster than others.
So, for example, if the sound in my head has anything to do with chorus, phasing, or supersaws — especially in stereo — I start on the Super 6. The Peak has decent saws and actually a really nice chorus. But the S6 is kind of built around it. What’s extensive menu diving on another synth is just assigning an LFO or pushing DRIFT fader on the S6 — so It’s going to get there faster and with less friction.
If I know a sound is going to involve even a moderate amount of modulation, though, (and especially if I don’t have said modulation 100% planned out yet) I tend to reach for the S6 last. It has extensive modulation options, of course. But they’re harder to set up and “see” than the Peak. And of course the Peak has those awesome Animate buttons that I always end up finding a use for when they’re available.
Point being, very few modern polys are going to “lock you out” of a sound. Some will just take longer to get there. The Roland-y sounds you’re hearing from the S6 don’t mean that’s all it can do… but I do think it’s a fair reflection of what’s easiest to set up on it. And that’s as good a reason for preferring one poly over an other as anything else.