Ok, I'll give this a stab.
For Episode 1 I'm a big supporter of Return of the Sith by a fan editor called Seciors. He's made the radical change of removing the Darth Sidious character from the film entirely. I feel this improves the overall experience in three ways. 1. It makes the Trade Federation appear far more assertive and decisive now that they aren't following someone else’s orders. 2. It makes Darth Maul's introduction and presence in the film far more mysterious. 3. The surprise that Palpatine is Sidious is retained.
Seciors has also removed all of the underwater sequence from the film. The Jedi now just head straight for the Palace and rescue the Queen. The first fifteen minutes of Return of the Sith is blistering entertainment - and this is coming from a pretty harsh prequel critic.
It's also worth noting that Seciors has also removed the terms "trade" and "tax" from the edit.
For Episode 2 I like L8wtr's Republic Divided. L8wtr is a good, thoughtful editor and he has rescued the Anakin Skywalker character as well as restored the Obi-Wan/Anakin relationship in this edit.
For Episode 3 I watch Kerr's Dark Force Rising. Lots of great cuts there to streamline the Revenge of the Sith experience.