I would go for Vallejo Model Air if airbrushing & for Vallejo Model if hand brushing.
Both have dropper bottles & due to that feature are more economic. Used Revell acrylic & despite major thinning found they clog my airbrush some thing awful.
Have a few Revell acrylic pots & have found them good for hand painting small items.
Laurie
Apologies I have not really answered you question Simon.
I used to use Humbrol and switched to Vallejo Air and Colour as well. Same kind of experience, I was amazed at the difference when I first used Vallejo in the airbrush.