Surviorman tries to teach average folk what to do if they happened to be stranded somewhere. He usually gives you knowledge that most people could actually use if they had to.
Bear's show is just pure entertainment. The way he climbs down waterfalls, or climbs to the very top of the the rainforest canopy to get a look...most average people would have either died or broken many bones attempting things like that.
I think both shows are great, if you go into to them expecting different things.