alot of it depends on what, and where you tape. For indoor, bassy rock shows, omnis can be tough to get a good tape, unless you are close to the stacks (not impossible, there is a great U2 MSG tape that was done midway back on the floor with 4061s). For this type of environment, card elements give you a more directed pickup pattern which would be more ideal.
I use the AT853RXs because I tape in the previously mentioned environment....just my :twocents: