I flew an RV-3 for about 400 hrs before buying the Pitts S-1S that I have now. About 600 hrs on the Pitts now. I've been fortunate to have flown eight different S-1 Pitts', including the S-1C, S-1D, S-1S (factory), S-1S/E, and S-1T. How they handle on the ground varies greatly depending on how they are set up. I've flown pretty much all combinations of landing gear - bungee, rod (Wittman), and spring gear, as well as various tailwheels including steerable (Maule and API) and locking on both rod and leaf springs (rod spring only for locking TW). The original bungee gear, leaf spring, steerable tailwheel Pitts S-1 is the king of sensitive airplanes on the ground. It's actually a bit shocking the first time you fly one. But it's totally honest - does what you ask. You just have to re-train your feet. It'll swerve lightning fast, but is very controllable on the ground. Put it down straight and learn to move your feet as little as possible, and life is good. The Pitts S-2 is heavier, less sensitive, and more stable on the ground. It's worth doing transition training in one, and is as close as you can get with a 2-seater, but does not perfectly replicate the S-1 experience.
That being said, an S-1 Pitts can pretty much be made as friendly as an RV on the ground with spring or rod gear and/or a locking tailwheel. In this case, the main difference with the Pitts is the faster touchdown speed. I hate locking tailwheels, but they do remove a lot of drama, and protect newbie, hamfooted pilots from themselves. RVs of course, are very stable and friendly on the ground. I once broke a tailwheel chain clip on landing in the RV-3, and did not even notice until I was at a crawl on rollout. That's a good way to ground loop an S-1 unless you're on your toes. It goes without saying that the Pitts has a higher power off descent rate, more drag, and much worse visibility on approach/toudown. I actually prefer the drag and descent rate over the clean RV. The Pitts is the best slipping airplane ever built. You can drop it in from impossibly steep angles, and putting it where you want power off feels like cheating. You won't necessarily glide far in an engine out situation, but you can vary your glideslope significantly more than you can in an RV. You just won't appreciate how weak RVs are at slipping until you've done a full deflection power off slip in a Pitts.
Regarding 3-point vs. wheel landings, wheel landing the S-1 is absolutely pointless, and IMO more risky for newbie S-1 pilots. I do about one in a hundred in calm conditions just for the helluvit. I'm not anti-wheel landing other airplanes, BTW. The S-1 has a short wheel base, heavy tail, and surprisingly little rudder authority with the tail up. Wheel landings just chew up excessive runway for no reason. The S-1 has lots of aileron authority at 3-point touchdown speed, even in nasty x-winds. And unlike RV's, the Pitts is a pretty much a shopping cart after touching down 3-point....it just doesn't want to go flying again. I'll leave it at that on wheel landing these things unless you're interested in more detail.
The first video below illustrates why I recommend against early wheel landing attempts - especially with bungee gear. It's very stiff, and not easy to kiss the ground smoothly. The pilot here made the wise choice in straightening his left arm on the first landing attempt, and got it down smooth on the 2nd attempt, but came close to losing it as he was letting the tail down. Note my comment above about limited rudder authority. BTW, there is plenty of rudder authority in flight - even with the small original rudder. I have the double hammerhead video to prove it.
The second video is mine, and shows how I like to do it - power off, slipping turn, runway in sight the whole way, 3-point touchdown. I don't always drop it in this steep, but shows what you can do. No real headwind help that day. I think landing a Pitts is as much fun as acro, and I always do a few T&Gs at the end of each flight.
I still think the RV-3 is THE best all-around sport plane ever designed, but....there is just something magic about the little Pitts. Got carried away. PM me if you're interested in more info. Oh, and I do a little acro as well.
http://www.youtube.com/watch?v=BVy_Q8luPxE
http://www.youtube.com/watch?v=zERCozXB3Bo