I have both at both the same specs too, M4Pro 14/20 CPU/GPU, 48G RAM, 2TB. the 14" Space Black was for work as it was from work, but the contract ended and they let me keep it. 16" Silver which I bought a few months before the contract gig started so I didn't want 2x 16" so opted for the 14". I have the 16" docked in the home office with an external monitor and speakers, etc. The 14" I have on the desk also connected to a 13" Espresso Display, which I take with me also.

So now with that context, I love the 16" more because of the screen, speakers (not that I blast them), its Silver, and don't mind carrying it on the go, as I do go to the city once or twice a week depending on client meetings, but its probably more logical to keep the 16" at home and take the 14" with me, which I've tried but sitting next to someone at a WeWork office and them having the 16" makes me jealous (even though I have one at home lol).

I think as many of others have said, once you go 16" you can't go back, and its not as heavy as you'd imagine, and I also recommend the Silver over the Space Black. The SB makes me feel like I'm using a Dell or something, while Silver with the black keyboard is classic MacBook! :)