I don't follow Rugby Union, so I have to say, if I watch it, I'd rather on TV because the scrum looks like a bunch of guys standing round (I find myself looking at the screen at the ground to try and see where the ball is).
Car racing can be good on TV if they don't just focus on the lead drivers...but generally speaking, I prefer all sport live if money and time affords it. The crowd and being up close are big draws for me.
Are there some sports that are better on TV?
South African Victor Matfield claims a line-out ball in a 2006 Tri Nations Series test match. Source:Wikimedia Commons Photographer Hamish McConnochie .
Some sports are just better on TV, particularly those with a large play area like rugby, hockey and baseball. It's still nice to go to a game every now and then but I'd often rather get an up-close view of the action that comes from a zoom lens.