Extreme

I did 2 years of Ju-Jitsu, its an awesome skill with many of the blocks and throws leading to a break if executed properly.

I also did freestyle kickboxing which was less deadly but more effective in street situations and as a doorman I combined some of the arm, wrist and neck holds with leg kicks which were the most effective way of slowing an opponent down without punching them to the face which invariably led to them showing signs of damage which would have led to me getting charged.

Personally I think Tae Kwon Do sucks, I had to go toe to toe with one of the Scottish team and he never got a hand on me and took a real hiding from me. I know people who do it and as a discipline teaching control, humility and basic skills it is ok but not as style which will make you "handy".