Im working my way through them, from what I've seem both Gimp & PI just have manuals. which is fine for thoses that can use them, but they dont have the walk throughs that inffinty photo has, which are easier to follow, and in the same style as the tech IT manuals I use to write. As for videos, pretty much most are by those too well verse in them, that they speed through them, so its hard too follow. And the one thing I learnt most as an IT Trainer, was to dumb down. so ALL your students could follow. Affinity photo, as I see it, is going to fill a void. And will likely end up as the first go to stepping stone for many. That said, I will likely end up using PI, but only because I've done my homework first