I much prefer the older grips for several reasons. They look better to me. They sit flatter to your body when in a holster, or perhaps it's that they are smoother and don't drag against you as much. And you can pretty them up with an insert of your choice, smooth wood or metal, checkered same, elk antler with "bark" or not, turquoise, ivory, you name it.
And I like the half-lug GPs better than the full-lug, although they are hard to find now. I like the blued and stainless variations equally well--both look and perform great.
All this is mainly just my personal taste--I'm sure there are plenty who wouldn't agree.