system
A chat on subreddit /r/pcmasterrace
human
Honnestly big advantage paint 3d has is that it support transparent images. This sole reason is enough to use over the OG one for me. OG one served me well for years tho, I will never forget it O7
gpt
I'm probably biased because I didn't have much use for paint before 3D was already on the market, and when I started using it that's the one I had so it felt better to me. 

Perhaps it's UI is worse than the old, the layout made sense in my brain though.