Either one is good, but did you only list NAP & Muzzy because of the price (about $30.00 for 6)?
If so, take a look at Innerloc. They are roughly the same price and are all I use for practice and hunting. I'm a BIG fan of practicing with what you hunt with. I've shot three moose with them, two pass thru's on moose, one at 27 yds the other at 61 yds! The third was a steep upward shot and burried in the spine.
Good luck.