Well from what i gather – LMP (low medium profile) is a slightly larger diameter with lower middle which tend to give a more natural look as they aren’t so “pointy?!” and the high profile tend to be a smaller diameter but higher in the middle which tends to give a more “fake” look?
It’s probably best to have a look at a few piccies of both to get an understanding of what each looks like to get an idea of what sort you might want.
I’ve accepted you as a friend so you can have a look at mine – not a pretty sight but I’m chuffed with them!
xx