It's hard to get beyond Eddy Merckx, given his long list of wins and the aggressive way he achieved them.
I would have thought Jure Robic would have merited a mention. He's arguably the greatest ultra endurance cyclist of modern times.
Most career victories by a professional cyclist: 525.
Most stage victories in the Tour de France: 34.
Most stage victories in one Tour de France: 8, in 1970 and 1974 (shared with Charles Pélissier in 1930 and Freddy Maertens in 1976).
Most days with the yellow jersey in the Tour de France: 96.
The only cyclist to have won the general classification, points classification and mountains classification in the same Tour de France (1969).
Most victories in classics: 28.
Most victories in one single classic: 7 (in Milan–San Remo).
Most victories in Grand Tours: 11
In 1972, Eddy Merckx set a new hour record at 49.431 km (30.715 mi)
Chris Froome is clearly a top cyclist but he, like SKY, tend to focus their efforts at a few select races.
Wiggo, despite not winning the TdF repeatedly, stacks up better than Froome (in my opinion) because of his versatility and track achievements. I do feel sorry for Froome though. It's not his fault that his technique is more effective than stylish, or aggressive. He just spins up hills, staring at his power-meter, all elbows and knees, pissing off the French in the process (which is a good thing obviously).