You haven't listed all of the relevant info for each health plan.
Are the deductibles the same? Copays? Coinsurance? Out of pocket max?
Maybe the high-deductible plan has a much higher deductible than the HSA plan. Perhaps the "non-HSA" plan here has a $15,000 annual deductible for an individual. That would cost less than a $6350 deductible, which is the highest a deductible can be for an individual while still being HSA-eligible. Or maybe the HSA plan is at the low-end - $1300 annual deductible.
HSA-eligible does not automatically mean "lowest premium".
I was going to post to say the same. It's impossible to compare without knowing the following for each:
1) Annual premium cost (to you, I guess, since it sounds like some of the plan cost is subsidized by employer, and the other part comes out of your paycheck pre-tax)
2) Annual deductible
3) Info. about co-insurance or percentage the plan pays after you meet the deductible (sometimes this is written as 80/20 or something similar)
4) Maximum out of pocket limit with the plan. You are saying "out of pocket" in your first post, but I think you mean the cost of the premium that comes out of your check, not the maximum out of pocket limit that the plan would cover.
5) Compatibility with an HSA
For example, one plan I'm looking at for next year has a deductible of $2,600 and then the plan pays 85% until the out of pocket maximum of $5,200 is reached. I personally prefer 100% plans where, once the deductible is met, the plan pays the rest.