10x Classic vs the 10x HD = picture everything you like about the 3-9HD (including the bolder reticle) add parrallax adjustment and you have the 10x HD.
I've had a few 10 and 6 classics and they are great on a rimfire due to the closer parrallax adjustment but they can't touch the HD versions in my opinion.
That said, I have 3-9's and sent the 10x HD back cause I had it on a calling rifle and it was a bit much up close.
