I think it has more to do with what one likes as to taste. As long as the meat is tender, which I've rarely come across a tough deer, I always enjoy a venison meal.
I eat a lot of game meat, elk, deer, antelope, and even the occasional moose treat, love all of it! But if I had to label one type of deer as being the best tasting, I would probably go with White Tail.
As for size, age, or what time of the season, a younger buck prior to the rut is probably not as strong tasting, but I really don't mind strong tasting game meat. This year alone, I have ended up with 4 or 5 late season white tail bucks (Rutting) in the freezer, and as many mule deer in the rut, and I actually prefer that stronger game taste, which is why everyone gives them to me.
I age my deer meat by wrapping it real tight in a couple of game bags, hang it in a 35 degree cooler for 5 -7 days depending on size, elk gets hung for 10 - 14 days. I spray the exterior of the game bag with a 50/50 water / vinegar solution once a day to prevent the exterior from drying out, and to rinse some of the blood and fluids off. I remove the back straps prior to hanging, and will wrap them separately with game bag or cheese cloth, I only hang them for a couple days.
GS