Lulz. Ok here I goes.
I've owned horse/shell, calf, kudu and Bison. All leathers are cool but horse is most resilient and interesting to me. I guess I haven't tried kangaroo yet but one day. If I see a nice pair of bison in my near future I'd grab that too.
I don't beat my boots to the degree of going hiking in them. But I wear them in rain and walk a few miles a day.