If you are going to use the AI products heavily, you should look for a computer with a beefy gfx card. The MacBook Pro is a solid choice overall, unless you are into the new Video AI software. It currently uses only the CPU and is due to this terribly slow.
I have a 2018 MacBook Pro with the Razer Core X Chroma eGPU and a Radeon 5700 XT, and the eGPU is MUCH faster than the internal GPU for the photo AI products.
As far as I know, Topaz are working on AMD gfx support for Video AI, and this setup should be crazy fast once this update is out. At the moment however, only the photo AI apps benefit from the eGPU - but at quite a measure (at quite a price).
The 5700 XT eGPU is about 4x faster than my Macbook GPU (Radeon Pro 560RX).
The CHEAPEST solution would probably a custom-built Windows PC with a Nivida 2080 RTX. A Windows Laptop with eGPU isn’t the safest bet - as fas as I know, eGPU support on Windows isn’t the greatest.