Each one does something different, and each has it's own philosophy. You'll have to decide what you want in the realm of realism. RUB and NYGM aim for ultimate realism, but that's in the eye of the beholder. IUB and GW aim for a balance, but those who use them find them realistic as well.
I use parts of different mods; partly because I have my own philosophy and partly because I'm just perverse. Hopefully people who play them will explain what they like about the ones they use.
This question has been asked on average at least once per day for the last three months. We need a sticky!
