My understanding is that there are basically 3 grades of white tea:
Silver Needle (Baihao Yinzhen) - Buds only.
White Peony (Bai Mudan) - Buds and the first two leaves of the shoot.
Shoumei - This is basically the leftovers from the production of the first two. It's what get's typically sold (often blended with light Oolongs) as "white tea" in teabags at the supermarket.
I have tried Adagio's Silver Needle and White Peony. Both are excellent in my opinion, with the White Peony slightly stronger in color and taste as expected.
I've also tried their White Symphony and Snowbud. White Symphony is basically White Peony with extra buds. I didn't really notice much of a difference between it and White Peony as far as taste/color goes, but could definitely see there were more buds. Snowbud is supposed to be a lighter version of White Peony with only the youngest buds/leaves. To me at had much more of a green tea taste (grassy, vegetative) than any of the other three.
The SIlver Needle and White Peony will deinitely be my two go to teas going forward.