What cartridge are you replacing? The ZYX R100 could be to lean sounding depending on the balance of your system. The Dynavector 20x2(low) is a solid allrounder. FWIW some claim the 20x2L has some of the characteristics of the Transfiguration Axia($2495).
I agree the 20X2 (low) is a very evenly balanced cartridge. Dealers often pair them w/ Rega's, but this could be true of Zyx, if they had a larger dealer network. Since the .24 version of Zyx is conservatively rated, it may actually have the higher output.