O ring or X ring chain

If you do a lot of offroading and won't be lubing your chain regularly, the o-ring chains work well. They hold the lube in and dirt out...

If you can stand to lube your chain once in a while, do with a non o-ring chain and reap the power benefits.
 
Non O-ring FTW, I ran a o-ring then switched to a non o-ring D.I.D. ERT2 and like it way better.

When you have a small amount of H.P. like a blaster why lose some just so you don't have to lube????