I literally have the 18 core Xeon iMac Pro, with 64 gigs of RAM. I bought the Macbook Pro (not the Air) with 16 gigs of RAM and 1T SSD.
Not as concerned with video editing and renders. The iMac Pro can wreck the Macbook on specifically OBS software x264 encoding, while OBS is not Apple Silicon-native. Repeat, software encoding, not attempting to use the hardware chip (there can be issues streaming to YouTube using it). This is the one case I've found, of anything, where the iMac Pro wins.
I tried Minecraft, as there's an M1-native version out there. My old intel Mini: 70 fps. The iMac Pro: 240 fps. The M1 Macbook: 270 fps.
I'm gonna say it's rare that my M1 Macbook Pro does NOT beat my Xeon iMac Pro at four times the price, four times the RAM. Again, I literally own both. I've even found a purpose (software x264) where the M1 machine can't keep up. It's the only thing I've found so far, where the M1 isn't faster. Everything else about operating this machine is faster than the iMac Pro, which remains my primary desktop I use every day.