If you type the names of the two cards you want to compare into Google (or your search engine of choice) you'll most likely get a comparison benchmark. Here's a link comparing the two you mentioned.
I think it just comes down to personal preference though. For me, I had a few bad experiences with AMD and had to replace 3 cards in 6 months but with Nvidia I've only had one replacement in many years so I'd never go back to AMD. That said, I'm sure there are people who will swear by AMD and have plenty of Nvidia horror stories so best bet is like I said to type the names of the cards you're considering into Google and you can judge for yourself based on the benchmarks and what suits you best.
For Photoshop it doesn't really matter. It's not particularly GPU-intensive. You basically need a card that works, with a reasonable amount of VRAM.
High performance cards are needed for gaming (or so they say; I wouldn't know) and arrays of several 4K displays and so on.
NVidia seems to be a little less bug-ridden than AMD. Or maybe that's just my impression.