It's all about preference...but after spending well over $2k on the laptop, an extra $50 is pretty nominal.
For me i went with the AG since i had a previous gen 13" with glossy screen and i got annoyed by reflections on the screen when using it in places with alot of lighting.
I do admit that the glossy screen had more of a "bling" factor cuz its all shiny but after a few weeks i just got annoyed.
IMO, glossy for bling and AG for function.
AG really should have been a no additional cost option but thats apple for ya...