Both of these could definitly be worn seperate but I use both (in waterproof cause I have over active tear-ducts) with the falsies first and then the lash blast second. They dont flake at all and the 'very black', which is all i every get mascara in, looks great. They only down fall I have is that it is a little more difficult to get off since it is waterproof. Besides that it is great!.
I have tried other mascaras that say they make lashes look longer or what not byt they do fall short compared to these two. They were each about $8.00 but well woth the cost. If I had to only live with one it would be the lashblast just because I like the brush a lot better.