I've tried them both and each time I wear either of them I am complimented on my lashes. I was asked by people who know me well - including my own mother - if I had extensions in.
They are £18.00 each from Cult Beauty and more than live up to the industry favourites from the bigwigs such as Dior and YSL.
Which the obvious exception of the applicators, I didn't really see a difference in performance between the two. I think I prefer the Volume Lash because the brush is especially short - something which most brands don't realise makes application SO. MUCH. EASIER.
If you can't afford/can't be bothered with extensions - these are the next best thing.