look,
any grab mod will be well competative as soon as we will get breakable grabs.
any striking mod will be well competative as soon as we will get health bar

for grab variation of mods that can be competative and favor the one who is more skilled you can have:

aikido7 (aikido with limited grab)
sw4 (spiritwrestling with limited grab)

these were my best attempts in creating something general but favoring understanding of movement over noob-proof lame crap.