In my opinion the blacktail deer is by far the most challenging species of deer to hunt in north america mainly because of where it lives and how elusive quaility bucks are. If nice blacktail bucks were easier to get there would be more hunting shows on them.

i never hunted them,but from everything i read and heard about,the Coues deer was the most challenging

I added the Coues deer for you

I also heard they are tricky to hunt

The Whitetail and Couesare the same species.
As is the Blacktail and the Mule Deer.
Only seperated by subclass

Whitetail=odocoileus virginianus
Coues=odocoileus virginianus covesi

Mule Deer=odocoileus hemionus
Blacktail=odocoileus heminous columbianus

Proves that both the Whitetail andMule Deer are both masters of the enviroment.

I voted for Whitetail.

I've never physically seen a mule deer, coues deer or blacktail so I voted whitetail. Watching some of the hunting shows on TV it looks like the mule deer are a little stupid at times.