I’m with Dasy on this
I used to have a definite preference for Campag, but my last bike came with Ultegra SL and I’d be loathe to go back now. I like the lever action, it’s easy to use and it’s durable.
Mind you, I’m not going to say no to 11 gears – continuous drive would be even better or maybe an eng… Okay maybe that’s going a bit too far.