Affinity has really sophisticated colour editing controls.
For example you can apply adjustment layers and then use a blend curve (not just blend ranges) to moderate it. So if you want warmer shadows, it's as easy as using a colour temperature adjustment to warm up your image and then adjusting the curve so that it doesn't apply where you don't want it.
And you have cross-model curves: you can apply Lab curves to RGB model images without converting.
It has a Capture-One-style HSL wheel. It supports LUTs (and LUT inference!)
I can think of some things Photoshop does that Affinity Photo does not, but I've been using it nine years now for my photography and web work (along with Designer). I think for almost every normal Photoshop user[0] there's no reason not to use Affinity Photo instead.
[0] Unless you're particularly wedded to Lightroom, for which there is no Affinity alternative.
For example you can apply adjustment layers and then use a blend curve (not just blend ranges) to moderate it. So if you want warmer shadows, it's as easy as using a colour temperature adjustment to warm up your image and then adjusting the curve so that it doesn't apply where you don't want it.
And you have cross-model curves: you can apply Lab curves to RGB model images without converting.
It has a Capture-One-style HSL wheel. It supports LUTs (and LUT inference!)
I can think of some things Photoshop does that Affinity Photo does not, but I've been using it nine years now for my photography and web work (along with Designer). I think for almost every normal Photoshop user[0] there's no reason not to use Affinity Photo instead.
[0] Unless you're particularly wedded to Lightroom, for which there is no Affinity alternative.