I love the look of the early gmc grille so it would be an easy choice for me too, but if you are worried about install the later 48.5 grille is a lot easier to install and still looks great.
I have had both, both look great.
IMG_0876_zpsrv9ekd1b by
Joe Doh, on Flickr
IMG_2983 by
Joe Doh, on Flickr