I am a full-time UX Designer currently working for a Fortune 500 that was previously using the 14" 32-Core M1 Max with 64 GBs of RAM. That was unnecessary overkill.
When I switched companies, my previous company took it back and I was given a 16 GB Base M1 MacBook Air and it still works wonderfully for Figma, Sketch, Adobe, Teams, etc.
Here's my decision tree for you:
1. Do you have an external display - If no, then get the 16" MacBook Pro. If yes, get either the MacBook Air or the 14" Pro.
2. Are you willing to pay about $900 more for a better screen, better webcam, and a little bit better future-proofing in terms of CPU and GPU power? If yes, then get the 14" Pro. If not, get the Air - but make sure you upgrade the RAM to 16 GBs.
Other notes:
-No need to upgrade to the M1 Max in any variant. UX Design isn't demanding enough to require that upgrade, and it just costs money and gives you a warmer machine with less battery life.
-The only upgrade I *MIGHT* consider is upgrading the ram of the MacBook Pro to 32 GBs - just for the sake of this truly being a professional tool that will make you money and the cost is relatively low, but even then I don't think it's necessary. I wouldn't even upgrade the SSD. I have a 256 GB MacBook Air and with Figma being in the cloud, I don't store nearly enough files to warrant the extra SSD storage upgrade.
-The Air form factor and portability are superior and feel better than the 14". It is just so slim, and lightweight, and being fanless is so nice. I work on this thing 8 - 10 hours a day with Zoom, Teams, Edge, Figma, Miro all open at the same time, and overheating is not a problem. I would honestly go into a Best Buy or Apple Store and feel the difference for yourself.