Yeah, but your wind-up is irrelevant because a Honda Black Widow 750 (basically a Shadow, but with some unspecified differences that makes it faster) can whup any other bike on the road... apparently!!
There's no trolling here... just piss-taking of what ended up being a silly question. This is a Yamaha forum. Any Yamaha is the best, as far as we're concerned... and we're not very, at that. As you said, both bikes are fine. Some people disagree.
Pilot (aviator) is more a term applied to riders of big, fast bikes like Sports Tourers. But since it also applies to the pilot of a big, slow cruiser ships, it might as well apply to big slow Cruiser bikes as well!!
Virago means various things, depending on what point in history you're reading.
If you wanna argue pure specs, I believe the Drag's slightly lower torque kicks in at notably lower revs (4.5-5k), which is why it is faster off the line.
Averaging the specs out from 11 different reviews:
535 - 43.81HP (32.1kW) @ 7500rpm with 48.00 Nm (35.4 ft.lbs) @ 6000rpm
650 - 39.42HP (28.8kW) @ 6500rpm with 50.10 Nm (37.0 ft.lbs) @ 5000rpm
Incidentally, you can forget ANYTHING that MCN says. It stands for More Crap than News and is basically the same made up tabloid bollocks as The Sun newspaper, but with more tits and less bare breasts.