Help with GAS? So do you want us to convince you to buy one or not to buy one? 
I don’t have a Subsequent 37 myself but I did take a good look at it a couple of years ago when I was looking for a mono synth. And I do have a Matriarch.
While I think there’s obviously a certain moogness to the sound of both synths, I think they’re very different from each other. I prefer the Matriarch for a lot of reasons, but it basically depends on what you’re looking to get - what role are you looking the Matriarch to fill. I’m sure the two would also co-exist nicely. If you think you could get good mileage out of the 4-voice paraphony, stereo filter and delay and extensive semi-modular capabilities, then Matriarch is an awesome pick! Then again, considering that you have an OB-6 and a Subsequent 37 and a Subharmonicon - that’s three THICK sounding synths. Like on the OB-6, on the Matriarch the filter is your friend, so no problem probably. But worth giving some thought to.
Perhaps surprisingly there doesn’t seem to be an actual comparison video between a Subsequent 37 and Matriarch. There are a couple between a Sub37 and Grandmother, so maybe take a look at those.
All in all, if I were you and was able to fund the majority of a Matriarch by selling some gear I don’t use, I would definitely go for the Matriarch. That’s pretty much what I did a couple months ago myself, actually.
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