I tend to lean towards tractor pulling myself, more personal preference than anything. I hope one day to have the money and/or sponsorships to run in the super farm class if not higher. There is alot of variability in the pulling world, but I think the fun challenge becomes creating an equation that allows you to determine that variability and reign it in (i.e. understanding track characteristics by watching how they prep it, getting your weight transfer equations dialed in, understanding your transmission capabilities gear by gear, fine tuning the coeff of friction in the rear diff to minimize pull to one side of the track or the other). Power never seems to be the issue these days (at least in the advanced classes I've watched at L-ville, Gordyville, et al), it's always traction and ballast...fun things to think about and "tune." Off course, there is always luck of the draw in the pulling world too in where you end up in the lineup of machines.
There still is some danger in the pulling world..anybody remember seeing this at Gordyville?
[ame="http://www.youtube.com/watch?v=TPv_cxUGwYI"]John Deere Super Stock Tractor Looses Wheel at Gordyville Tractor Pull 2011 - YouTube[/ame]