I've used both in low. I originally bought the .... err, 'orginal', and was quite happy with it. Later the 2.0 came out. A while afterwards I became concerned I was having too much palm contact so as it was available I tried it. Again it worked fine.
I have again tried the original after using the 2.0 for a long time. I found I had an inconsistent 'cock' to my wrist (rotation angle) so I need to keep all fingers to the side, none resting on the front of the riser. I hadn't noticed this with the 2.0. I'm now checking whether I need to do likewise with the 2.0.
Which to choose?
Hard to say. My hand size is medium for a man. A large hand, go original; a small hand go 2.0. Prefer a narrow, go 2.0.
Have a best on an oly set up & best2 on BB & hunting set ups - I find the best gives me a higher wrist with a bit better palm contact but I need to rotate my wrist into it so it takes a bit longer to set up - the best2 seats faster but feels a little less stable so I have to watch for relaxing my hand more - 6 of one 1/2 doz of the other - both are better then any other grips ivevshot - M