To the stability comparisons, in my personal experience, I've found that Buzzzes are far more forgiving to OAT than are Rocs. I have newer player buddies who throw 50'-100' shorter than I do, but torque over my stable/os Rocs every time they throw them. Buzzzes can be thrown sloppily, like a fairway driver, really. Rocs not so much.
Generally, I put little faith in the name/run/11x/10x/etc of Rocs. I've found that there are Rocs of every stamp and run that are well worth throwing; and others which are only worth throwing in the garbage. My preference is to keep a look out at all times for good Rocs, throw them all and sell the ones that I don't like. That's not a criticism of the mold, as I had to do the same thing with Buzzzes when I threw them. Everyone likes a different Roc, so you're going to have to try a few before you find your niche. I'm not a big arm, but I still prefer throwing max weight or close to it.
My personal favs:
Stable Mid-Range Driver Rocs: The Rocs that have that text under the graphic of the bird are the most consistently butter of all the runs/types I've thrown. They're all good, firm, grippy plastic that beats in slowly without chunking. They're not as expensive as hard 11x typically, and seem to have less tendency to chunk. Every color I've thrown are money. I also just like the way they feel in my hand compared to harder Rocs.
11x Firm/Hard Run A lot of guys throw these, which pops up the price. But brand new, they're super overstable. They can even handle my sloppy forehand when I have to throw an escape shot. But again, the demand makes the new ones tougher to find, and more expensive.
Ching Ching Rocs act differently than domier Rocs. They seem to fly with more penetration than glide compared to domier runs/versions. I keep one in the bag for hyzerflip-to-flat/straight duties. There are a lot of "flat-top" Rocs that are being sold (Dynamic Discs has them right now). But the best part about Ching Rocs isn't the flatness -- it's the plastic. Which has a similar feel to the Stable Mid-Range Rocs.
Used-bin-any-stamp-pick-it-up-and-wow-this-feels-really-nice Rocs Sometimes you just find a gem. I've found 12x and newer DX and the like that just feel great. And when they feel great, they usually fly great as well.
My personal hates:
Champ Rocs A lot of guys carry a champ roc for overstable duties, others talk about how they want one. In my experience, Champ Rocs fly like bricks. Yeah, they're overstable, but they don't fly like a Roc should. For that reason, and due to the silly cost, I steer clear of champ Rocs. I keep a new Roc in the bag for light headwinds and fading shots, but for true overstable duties, I'd rather throw a Gator or a Trident.
San Marino/Ontario Rocs Maybe it's mental, maybe it's that I've never thrown a SM or Ontario that was molded in good plastic, but I hate both. Ontarios fly like a new Z Comet to me. I like Comets, but that's not what I'm looking for in a Roc.
150g-170g Feel and fly like toys.