We have 6~7 different working 3.55+ CFWs, the odds are, all of them will work perfectly and you won't notice any major difference between them, so how you want us to tell you which one is the best?
I tend to consider Rebug the superior CFW, but that's mostly because they test their stuff a lot before releasing so you usually get the final version in your hands, while some devs released lot's of upgrades to fix the issues that shouldn't even been on first release to begin with (Rogero, SGK), even so, they're all fixed up now and pretty much all of those 3.55+ CFWs are good to go.
As for tutorials, there really isn't much to tell, you're on 3.55 Kmeaw? Install 4.30 Rebug over it. Seriously, that's pretty much it. If you want you can also install Rebug Toolbox on Kmeaw to enable QA Flag, but remember to remove the disc on the drive to make sure you won't use it's upgrade instead.