Between the two (I have both), I prefer the Bravo-1. That's just me, though. Both are good knives. Both will take any punishment you can dish out. Both have bullet-proof warranties. I think what it comes down to for most folks is personal preference. For me, there are a couple of functional and aesthetic differences that push me to prefer the Bravo. I'm not a raving fan-boy of either, so these are just my simple observations.
My main beef with the RC-4 is that the handle is on the small side (I don't have particularly large hands). It's a bit too skinny, but I can deal with that. I can't deal with the shortness as easily, though. It's okay when choked up on the choil, but when I want to get a nice full grip on the knife, it just doesn't balance out right.
I don't much care for the coated blade. Yes, it's protective and will help keep rust/corrosion to a minimum until it starts flaking, but I've found that it's thick and course enough that it can somewhat hinder performance in some areas.
The RC-4 has a decent sheath system as it is. I like it's funtionality in terms of strapping it to a pack or something, but I don't need a big ol' honkin' molle sheath to carry a knife on my belt. I like the kydex part... I'll probably fashion a simple lower-profile leather belt loop to attach to it. There's only the one optional leather sheath that I know of, and I simply don't care for the style. I ended up making my own:
The big win for the Bravo-1, IMO, is the handle. The handle fits my medium sized hands like a glove. Any grip I can think of with this knife feels great.
The Bravo-1 comes with a variety of handle materials. Some can be slick (which is easily remedied), while others can be quite grippy. If you want tacticool, you can get any of the various micartas. If you want a hint of old school, you can get bone, stag, or any number of woods.
If you're going to be whittling intricate miniature figurines with it, look elsewhere. The blade's a thick one, but it's a nice cutter regardless of that thickness. Would I complain if they made it thinner? No (I'm sure someone would), but the thickness isn't going to hinder anything I'm going to use the blade for.
The Bravo has a ramp. This seems to cause a lot of grumbling amongst the masses. If you don't like it, grind it down (or have BRKT do it, or order one without). It doesn't bother me, but who knows - maybe I'll grind it down one day.
BRKT's main weakness, IMO, is in their sheaths. I have no experience with the Bravo-1 kydex, but I don't think I'd like it. Looks to ride way too high for my taste. My Bravo came with the old school leather sheath from Sharpshooter which is okay, but nothing special. I generally don't care for Sharpshooter's leather. For reasons unknown to me, a lot of people rave about the Sharpshooter leather sheaths, but I've been less than impressed with the leather they use for their supplied sheaths. (In all fairness, their sheaths are mass-produced low cost items that shouldn't be confused with high-dollar custom pieces... and they fall under BRKT's bullet-proof warranty, as well.) All of that leather hate being said, I picked up a Loveless style pouch for the Bravo-1 from KSF shortly after they came out with them, and I love it. It's the first Sharpshooter sheath I've personally had that has even come close to living up to their claims of high quality.