Low for me, feels more solid.

 

Low grip better suits string walking in barebow, and a high grip is better suited for Olympic recurve. This doesn’t mean folks won’t venture outside of the norm.
As far as Jager and R-Core, they are both good. They each have pros and cons, but ordering from Greece is pricey especially for just one grip. R-Core gives 3 (maybe 4) options for grip finish/material. RCore, if I remember correctly, make more grips for a variety of bows outside of your typical Gillo, Hoyt, W&W, etc. Jager typically all have the same feel with their pad, but you typically pay more for colors in the grip. Plus, Jager is a US company so contacting/dealing with them should be easier.

 

I have used r core grips on 3 different risers. The process has always been smooth, relatively quick delivery for a custom made piece. I had a problem with their new automotive finish on a grip and they replaced it at no cost. Definitely recommended.

 

R-Core is able to customize a grip for you. I agree, I highly recommend this company!

 

I like a low grip with Jager Grip. I line up the edge of the grip with my lifeline with solid pressure on the heel of my palm as I push for a full draw

 

I'm a huge fan of higher grips. Just upgraded to a jager pinnacle 46 because it was the highest I could find and I love it.