Q1 is newer and has slightly different software upgrade and is considered their more rugged headset. V1 was replacement for Z9/Z91. V1 is much smaller. Both offer BA's voice control. V1 is older, and can be had for a better price. V1 is small enough to use without earhook if you can get it to stay in your ear canal - my canals are too small so I use the hook, but it's never a problem even with sunglasses.
Best way to get all the minor details in on Blue Ant's website.