What is the difference between active duty Army and AGR from cultural standpoint?

Chief, the difference per cultural standpoint is that you will be Full Time Staff for Reserve and/or Guard units. Which in itself has many cultural differences when compared to Active Duty. Instead of working with the same people all day every day, you work with a limited number of folks every day and the rest sporadic times to include phone calls and once a month. It's the mentality that is the cultural difference that I have seen between them.

AGR(Guard) you will be surrounded with a lot of wisdom from people who have been in that same unit their whole careers (or in and out of it due to transfers to sister units). You don't leave the state (PCS) unless deployed. as a warrant it might interest you a bit to talk with the Warrant Officer recruiting manager for the state and see what your pyramid for upward mobility is in your concentration so you have a good idea if you can make CW4 or possibly CW5. I can't speak on the reserves as they are their own ballgame and they shuffle the deck so it changes things because your global in your slot and assignments. As a warrant you will be the go to guy for stuff and as we called it...part of the warrant officer mafia. The warrants take care of each other and have the ear of the senior enlisted. Hope this helps if you we're considering AGR in the Guard.

In my opinion, the AGR Program has always been the best kept secret in the Army. I spent over 10 years in the AGR program in the Special Ops...and wouldn't change it for the world. I was Senior Enlisted but I can't imagine being a Warrant would be much different.