looking at replacing a bushnell sportview 4-12x40 with either a 4200 3-9x40 or 3200 3-9x50. Im leaning towards the better optics in the 4200 40mm but would I be rewarded more during low light conditions with the 50mm? It will be going on a savage 110 in 223 used for coyotes and groundhogs out to about 200 yards.