Your opening raises can be larger for one. In PL if noone has opened, you can only raise to .85, whereas in NL there is no limit (duh).

In PL you can get into situations that don't risk all of your opps stack. Say the pot is $5 and he has $8 left. In PL you can't force him to make a decision for ALL of his chips. In NL you can.

There also tends to be less preflop limping in NL compared to PL (at the $25 level anyways).