I'm biased, but I like felar and cloud giant.

Felar: less effective bearcharge, but you get to use claws + ranger spear/staff, you dodge better, no wrath/mental/disease vuln, and you can creep reliably without stepping out of camo.

Cloud: begins and ends with bearcharge. You should be able to kill any human-or-smaller person you snare who isn't bash protected or *supremely* juiced with damage reduction.

I would have a hard time taking any terrain/expertise combo that sacrifices snare or bearcharge. Some terrain choices leave you bearcharge, but its somewhat nerfed most places. (At least, that's how I understand caverndwellers working).

So basically for terrain I'd only go forest or mountain. For expertise I'd only go survivalist or savage.