Out of curiosity, what is your current rig, and how does that work for you?
Agreed with others. If you are a "pro" you will know.
IMHO, ram is the only option you should alter with Apple. Again, everyone's needs are different, but I would bump to 32 if you are even thinking about large prints or "print" type work. If its all web based with very few layers or edits, then pffft, even a MBA will be fine. Alhgouth the hundreds of $$ off deals on base 14" MBPs have been awesome, I don't think I would pass it up. for extra storage, just go external. PLENTY of great external SSDs with 10 /GBs speeds that will fly thru files. Ive seen 4TB for $250sih.
As a magazine print designer, running multiple multipage InDesign files, dozens of high res RAW real estate photos and everything else, my 2020 iMac can hit swap even with 128 GBs of ram. Rare, but Im always near 90-110 GB used.