Steffen twirls quite expertly in Two Pistols for a Coward. Its the only time I've ever seen him twirl before. He should've done it more often.
For my money I really love Giulianno Gemma's style. He's the best twirler in my opinion.
Eastwood was probably the most convincing. He was really non chalant, as if he was doing it for decades.
LVC is great because he's more about the steak than the sizzle. He didn't twirl alot but he always looked convincing. I liked how he almost never shot from the hip. He would actually extend his arm and aim before firing.
John Phillip Law was amazing with his rapid winchester shooting.
Nero was outstanding too. Especially in massacre time.
The style I hate the worst was Fernando Sancho. He had this annoying way of jabbing the pistol forward whenever he shot. I guess its his way to nullify the recoil but it looked stupid.
Outside of sw's I really like russell crowe's twirling.
I also tend to prefer traditional thumbing rather than fanning in westerns. We all know that fanning never worked in real life with those pistols.