Unfortunately, ima sherdog noob and don't know how to post polls but which strategy is more effective. I personally think finishing strong gives better results.
Do what Lawler does. Blitz round one, go for an early KO/TKO. If that fails, rest for rounds 2-4, countering and occasionally being hyper aggressive to earn at least one of those three rounds to the blind MMA judges. Throw everything you've got in round 5 for a finish / maybe get yourself a 10-8. Works for him so far.
No going all out means pacing your self for later rounds to really work. Blitzkreig is basically Tyson or AJ style using maximum energy early to defeat your opponent.