I've found a reason to frequent these boards again! Why can't I login under my old handle? Anyways...
Reading through these, I'm curious as to how many people have done what they're recommending. Alright, so here we go. I'll draw on my references from being a small bouncer (which does change the approach of things), well, at the time 5'6 183. Now, I'm considerably smaller and can't absorb punches as well, but I'd choose the same techniques. In a street fight, with someone who has no skill, I'd pick boxing. Most street fights don't last that long, and a boxer has numerous advantages; speed, technique, etc. I think the only time I ever have used anything I've learned in BJJ is a choke hold, very effective but only to stop a very bad situation. It takes considerably longer to learn how to properly roll, do take downs, get in guard, locks, and strikes in BJJ than in other 'sports'. I've never gone to the ground, and don't want to, in a street fight despite the majority of my training coming in BJJ.
It depends on the situation with someone w/skill. I'm drawing on my experience training. Against a Muay Thai fighter/Kempo/Karate fighter I'd go to the ground as fast as I could. Thai fighters are trained to absorb hits, so I'll probably get beat up quicker than I could strike. Otherwise, the latter two are going to kick eventually, and then I'll take them down where I'll more likely than not be better than them. A boxer, I'll try to use my kickboxing skills, because I can keep space between us and they probably won't be very good at taking me down (unless they're just huge).
What's the point of this? I think MMA are ultimately better but will take a far longer time to learn, not to mention master. Krav Maga is good, they have a school where I train, but against a good MMA I don't think they'd be better off. If you have the time and dedication to learn each MA to it's fullest, it's going to be better. I don't know a single Krav instructor who doesn't know some other MA. To say, just because the Israeli SF uses it doesn't mean anything. Our Army SF, the Rangers, uses BJJ, but also uses lots of other MA/defense. That doesn't mean it's the best, nor does it mean that they solely use only that without incorporating other arts.