Free: Contests & Raffles.
Don't knock them for being nocturnal, that is them being smart. . .
I think there are two different issues. If you ask what species is a true trophy the hardest to kill I would say blacktail hands down but not necessarily because of intelligence. Big blacktail bucks are impossible to kill most days of hunting season including the rut but might make a mistake on nasty stormy days when the rut is on. Most of the legal shooting hours they are bedded in country that is just not stalkable. Whitetails are spookier but because they are more agressive and habitual many get killed from rattling or tree stands on trails so they are easier to kill with rattling tactics or local knowledge. Blacktails are random and impossible to pattern and most of the time in doghair that is not glassable either. Mulies are the easiest due to increased technology for spotting and shooting distance. Individual bucks of each species can get very savvy however and nearly impossible to kill.
That's the thing about White tails I love. If you jump one don't figure it ran ahead of you and hid. If I spook a WT buck the first thing I do is back track 50 yards or so then sneak off to my right or left depending on the wind. WT bucks will try to circle around and get behind you. A few years back I spent most of one day playing cat and mouse with a buck, we probably never left a 10 acre area, he just kept circling and I kept guessing where he was going to go. I jumped him at least 6 or 7 times, never really seeing him, just flashes of an ear, tail or tine, finally he won and I never saw him again. It was that hunt that convinced me that they are the smartest deer and possibly smartest game animal period.
IMO a mature BT is the hardest to tag.... 7/8 of the country has a mature whitetail on their wall....
Reindeer.... Michael