I have some resources that might help;
This and
this.
But yeah, you have a good question. I try to lean towards the short and brutal side, because that's what real life is more like. You don't hear about awesome 10 minute kung fu street fights, but you do hear about a guy being jumped and beaten to death while walking home from work. But I guess it's good to have some fancy stuff, because having a story with one
curb stomp battle after another gets kinda tiring. It's up to you I guess.