I'm a member of both and would advise you to join them both, too. Just remember that NO political organization acts as the final defense of our gun rights. That role is served by our guns. The NRA and GOA exist so that we'll never need to use our guns to defend our gun rights.
Yes, I have problems with the NRA. I think they're WAY too concerned about being politically correct, too often framing the Second Amendment in terms of the "rights of sportsmen and hunters." :barf: Sure, they also discuss defense against common criminals. But that's not what the 2A is about, and it's not good enough. At the very least, they should be lobbying extremely hard for the repeal of the machine gun ban and the import ban.
When Charleton Heston held up that musket and declared, "From my cold, dead hands!" I was not impressed. Power-mad governments do not fear muskets. If it had been an AR-15, a FAL, or an AK, then it would have been somewhat more impressive.