Not to muddy your waters, but I've put down elk with a 30-06 and 165 gr bullets. That might open up more choices for you.
I've never shot the two that you mention, so I can't actually make an informed decision between your choices.
I've shot HSM sp 165 gr. and 165 gr. nosler ballistic tips (too light of a bullet in my opinion, but it did put down a cow at short range). I've switched to tipped tsx 168 grain cartridges, but haven't taken those into the field yet.
Any interlock or partition-style bullet should hold together well enough to get the job done. Find one that shoots in your rifle, then go to it.
Good luck.