I have three Loesch and one Shrewd. The advantage to the Loesch is in the wood, which is warmer, if you care, and in the range of models. I guess you could also specify specific features.

With the Shrewd (all experience relating to Mathews) it was better made by far, the Loesch didn't fit my bow's contours properly), and it had milling marks (that were polished over). The big advantage to the Shrewd is the metal allows an ultra narrow grip for the full length of the grip. The Shrewd Low is the same angle as the front of the riser, the medium is higher.

In theory the Shrewd Bowtech is now available: January 30 they wrote to tell me "the Bowtech grips should be available this month". The website hasn't been updated for a long time, so go direct and ask. The Shrewd is cheaper.

http://www.shrewd-one.com/