Whatever works for you.
I own and use both Macs, Dells, BOXX and HP for film, CG and motion design.
I would love to get a tricked out iMac but without a decent display pairing, I can’t justify it.
At home and work, we run the D700 fully loaded and they are doing fine with each OS and Adobe updates.
My PCs are mostly for Maya and the odd Resolve/Avid project.
Again whatever works for you.
If you need one today then make sure the iMac will deliver.
If you can wait till the new year do so and wait for all the reviews.