Well if i had to buy one i would go for the 30.08 it's two points bigger then the 30.06.:lol :lol :lol :lol :lol :lol :lol for real if i haed to choose the 30-06 hands down but both are great cal's .My 2 cent.
Either/or. Ammunition availability should be a wash between the two. Same calibre so the same choice of bullets. The 06 will have a slight edge in the speed department because of the extra case capacity, the 308 is available in a shorter action. They are both very capable for all Alberta game.
I like the Browning firearms. The two I have are solid and reliable. A little trimmer than the Rugers. I haven't looked at them recently but I was not impressed with the Remington synthetics when I did. The balance was off.