I don't have any experience with using the Edge on the Deck since I only play it in handheld mode, but I've been using it almost exclusively for about 10 months on PS5 and I really couldn't go back to a regular DualSense, the backpaddles are too nice to get rid off now. The trigger adjustment is also pretty neat, although I don't play competitive shooters so I'm not really part of the "target demographic".
That being said, I wouldn't have bought it at MSRP and I still don't think it's worth $200 USD (I got it on amazon warehouse deals for 40% off and it was basically brand new, if you can get it this way or otherwise slightly used elsewhere I'd recommend that instead).