when people say they train for the streets vs training for sports is on the streets you aren’t worried about illegal techniques or sportsmanlike conduct. In the streets one would have to finish the fight very early compared to the relaxed time limits there are in sports.
The difference between a good street fight and a sports match is training. for sports fighting, you train under a coach. Street fighting, you get experience by fighting. the more the better.
the street fighter fights out of necessity for survival. he doesn’t have a desire to become a star. in many cases, the street fighter is skilled in basic san da type techniques from body slams down to ground and pound. the only practice they get is getting into fights. and typically, as long as a street fighter feels he has an edge over untrained violent offenders, thats good enough for them. they have the confidence needed to survive. they know what its like to have that adrenaline rush and how to deal with it.
now sports fighters are on a higher level because they are sacrificing their life and time to training to beat other trained fighters. their conditioning is superior. but isn’t that already understood in advance? does it really take a genius to comprehend that? 
now, the fact that a highly trained sports fighter will most definitely whip an experienced street fighter with or without martial art background, this DOESN’T change the fact in any way that an experienced street fighter with a martial art background can effectively defend themselves against a violent attack by untrained assailants on the streets. the original purpose for martial arts was self preservation.
how does a street fighter prepare to fight in the streets? first, what kind of fight in the streets are you expecting? see. where i come from, fights are spontaneous. for example, you can be with your wife or child and some dude mistakes you for a gang member, or someone who jumped their homeboy, or someone just intending to cause you harm. you don’t need to be a sports fighter to handle a fool or fools like this.
back to what i was saying. street fighters train by hanging a punching bag in their garage and practice their striking (similar to boxing). a SF practices kicks and punches till they get better. they spar or play fight with their friends, even going to the ground. not training, but playful skirmishes. this is some of the ways the hone their skills.
do streetfighters care about the law? i would honestly say NO. when it comes to your life, the law is the LAST thing on your mind. " Hey man, we shouldn’t fight because we can both go to jail" doesn’t exist on the street. when someone swings at you, ITS ON. i have never thought about the law even when the law arrived. FUK HIM UP or he will FUK you up. plain and simple. the consequence of being arrested is a distant afterthought.
suburbs are way less violent…**** peaceful from a city boy perspective. streetfighters know there are other street folk with skills out there so they are more prepared because an encounter can happen at any give time. the unprepared are typically on the losing end.
on a competition level, sports fighting is better. realistic martial art training is sufficient for practical situations. regardless, both fight. unlike some people who claim to know how to fight.
what the heck do i know? i don’t know.