HSV please, it's more intuitive for people who are used to working with physical paints. HSL is useful for color and tone separation. HSV is better for choosing colors in an intuitive way.
Affinity has always had a very innovative business model, but it is often missing some very basic features that are preventing real professionals from switching, once and for all, to Affinity or that are giving professionals another excuse to go back to Adobe for example.
I love Affinity. Please add this feature and maybe the articles will stop calling Affinity things like "a low budget alternative" or "for beginners". Shut them up.
For users, please make as much noise as you can in this thread!