I've had Campy, Shimano and Sram. They are all great. You have to play with whatever you select, and you will figure out what your gruppo likes.

Red swept the podium at last year's TdF. Sram is top-notch. Tulilo Campagnolo who was a genius, died 27 years ago but his assistants/successors are doing a great job. I had his first gen Record '62 WOW. Shimzo makes really good stuff. I got Ultegra when it was labeled 600. Niice.