I strongly suggest getting the 8 core GPU if you are doing photo
editing.
I bought mine back in November and I am very pleased with the
performance and that extra GPU core helps to kick up many
of my apps a notch or two. Plus, the 512 GB drive gives ample
disk space to work with.
FWIW, my photo work is processing RAW images from a Nikon D7500
and use Adobe Bridge 2021 for photo management (as long as Adobe
keeps it free), DxO PhotoLab 4 for RAW processing, Affinity Photo for
"tweaks" and creating panoramas (which is M1 native), and occasionally
using Topaz Studio and EasyHDR3 for special images. All of these apps
are very "zippy" on the 8 core GPU.