Better worker, Bret or Benoit?
Tough, I'll go with Benoit. Benoit brought that legitimate tough guy, that balls to the wall, leave it all in the ring style. It was a bit more exciting and fan friendly than Bret's. I think Bret is one of the GOAT's in ring too, so this is a high compliment.
Bret style sometimes looked more like a chess match. Specifically the Iron Man match w/ HBK, the No DQ match w/ Diesel at Survivor Series, his matches with Austin at Survivor Series & Wrestlemania.
Benoit also wrestled a more aggressive, fast paced style, with a lot of move variations (snap & german suplexes) and still brought in the daredevil stuff. Its a bit more fan friendly than the traditional, methodical style of Bret.