Trying to decide between the two. Want maximum usable magnification. Have heard varying opinions on XRS at 30. Wondering if the ERS is similarly compromised at its max such that I could use the XRS to beyond 21x and get a better image. Worried about how visible the reticle subtensions will be if I can't get to 30x. I'm assuming that the ERS and XRS will have similarly thick lines and similar reticle views at they're max mags. Any opinions appreciated.