I agree with Mickey. I too contemplated the same thing back in 2000. My father and I opted for the Quebec caribou. Not bowhunting in our case, it was gun hunting. Anyway, we were part of the 2% that didn't get caribou. Not only didn't we get one...we didn't see ANY. Just like Mickey said, if they're there, there are lots of 'em, if they're not there...well, we did do alot of lake trout fishing and man was it good! Had a great time anyway, but would've been so much better if the boo were there. Worst part is my dad is too old to do another trip with now, so that was MY once in a lifetime trip with him. Still well worth it. I heard the group that came in behind us limited out on 2 bulls each in the first 3 days they were there. Aaarrrrrgggghhhhh!!
My advise...pick the animal that you want more and don't look back. Do the research and find the outfitter that'll give you the best chance at the best time of year and go for it!!
Good luck in whichever you decide and show the pics when you get 'em!!