Like both but the W. Tx mule deer eat primarily sotol and taste more beef like. There is limited sage or anything to give them a bad taste and they will only eat these things in really poor years. Most hill country whitetails are excellent but some in south Texas eat Cenizo or some sage like plant and can be almost inedible especially if this coincides with the rut. So it varies.
The only experience I have with mule deer is from W. Texas and the meat was far milder than a WV whitetail. At times a WV whitetail has a somewhat stronger taste due to the tannic acid in the acorns they eat, but that has never deterred me, a good cook (the Mrs.) knows how to get the "gamey" taste out of them.