I play modern rock/metal mostly, with equal amounts of rhythm and lead playing. When I play I need a pointy, thinner pick to have enough tactile feedback to be able to track the strings. The H3 pick is perfect for me. It's the right compromise between stiffness and thickness and can flex just enough to not trap me between the strings, but not to the point that pick flexing starts delaying attack and feeling sloppy. Also, that same flexibility and the smaller size of the H3, makes me feel that I have a more secure grip on it since it doesn't try to snap out of my fingers the way a thicker and/or harder pick would.
The surface is grippy enough that the pick won't start slipping between your fingers when you start sweating. That's a big plus.
They wear out a little fast though, but then that's the trade off for the flexibility of the material.
My recommendation is to buy a set of assorted picks and try them all, eventually you will find one that feels right.