I like a pair of 8X binoculars for hunting whitetail deer. For a long time I used a pair of Zeiss 6X that worked just fine too but usually it is the 8X for me.

The only time I carry 10X binoculars is when the country is wide open and the distance is long - and for me that does not describe my whitetail hunting.

For me any binocular with an objective of less than 30mm is useless for anything other than sporting events.