Which Real Techniques brush?

[LakeFlyPie]

I need a new brush for applying liquid foundation and have read good reviews for Real Techniques range.
However I'm confused about which is the best for liquid foundation / tinted moisturiser.
Can anyone advise whether I should go for the stippling, face or foundation brush?

TIA

The Expert Face Brush. It's definitely the best for liquid foundation.

I have the expert face and the stippling. I think they're both good but for different types of foundations.

For one that's creamier/thicker like lancome tient idole, or probably a tinted moisturiser, I prefer the stippling

For one that's more watery/thin like Urban decay naked, I prefer the expert face brush

Thanks both, I've got a couple of thicker tinted moisturisers and Bourjois Healthy mix serum which is quite gloopy but also a runnier liquid too; so as I suspected before posting I'll probably end up getting both