User blog comment:RoznosicielCiast/Exhaust vs. Ignite at top lane/@comment-4834593-20130221162001

I'm more a fan of Ignite than Exhaust, but that could also be because of the type of top laners I play, mostly Malphite, Renekton, Riven, Irelia etc, that either have burst (which combos with ignite much better than with exhaust) or have more damage than their enemy AND one or more ways to catch up, also making Ignite better, as you don't need to slow your enemy or reduce your enemy's damage, but can just amplify your own damage.

Or just take Teleport for those bot lane ganks out of nothing. :)

Oh, and if you're really confident, you can also take Exhaust + Ignite. I've done that for a while on Malphite, and my only problems were pre-six ganks. If you have someone like Katarina or Renekton (with a skillshot or friendly targeted dash on a basic ability) that might not even be a problem.