Shoot style? Right up my alley. Might as well chime in, especially since my Cover Scan Museum and Takada comps have already been referenced
Anybody who knows me, knows that UWFI is my favorite promotion of all-time. So much that I wrote a brief, probably crappy, history of the promotion that can be found here: http://s94991397.onlinehome.us/newsite/UWFI - History of.rtf
Here's my take on the major promotions:
UWF 1.0 - Not a huge fan but the good stuff is very good. They clearly didn't know what they wanted to be at first but eventually came around and there's several good matches to be found here.
UWF 2.0 - Great promotion. The bad stuff is really bad but the top-end stuff (Takada/Maeda 11/10/88 and others) is reaaaaaaaaaly good. Hottest promotion in the world at its peak.
UWFI - My favorite. Pro wrestling style drama mixed with shoot style. This doesn't always work but it almost always does, at least through mid-1995. And it worked for the fans too - UWFI in 1994 led the world in average attendance. And their actual show/match quality was really high - there are no bad UWFI shows prior to 1995. UWFI is also great if you like double crosses (Takada/Kitao, Takada/Berbick, Kitahara/150% Machine). FYI, to correct what was said above, UWFI DID use pinfalls but only on their very last shows. They counted as a loss of points rather than ending the match, however.
RINGS - RINGS is the most realistic of all the shoot-style promotions. This is good and bad. Their high-end stuff is really high end but there's also a lot of really terrible stuff with legit guys who don't know how to work. I'm a big fan of RINGS, having seen almost every one of their shows, but the inconsistency is a pain. They did eventually morph to being legit shoots but there's a couple legit shoots all throughout the history of the promotion. One problem with RINGS is that their scoring system and rules vary wildly from one match and show to another. Have fun figuring them out!
PWFG - PWFG is probably the closest to the UWF 2.0 in terms of style but...without all the quality. There's a few good matches but, in general, I think PWFG is pretty darn mediocre.
KINGDOM - After UWFI died, Takada started up another group with an eye toward looking more like MMA by using gloves and aiming for more realistic matches. Takada bailed out early on, however, never actually working any matches, going on to headline Pride. There's not a lot of good stuff in Kingdom but it's not nearly as terrible as you may have heard. The Kanehara/Sakuraba matches are fantastic, for example, and SUPER stiff.
U-Style - Sigh. Such a missed opportunity. Tamura starts the promotion, makes himself the superstar, and fills the roster with guys that are too small to compete with him (even though Tamura isn't all that big himself) and nobody gets elevated. The matches aren't great either. I enjoyed U-Style but it's not great
Personally, I'm not a fan of hybrids like Battlarts so you won't hear any comments from me on them.