I like both of your narrowed down selections. 2 more for you to consider for actual Hard Use. I have had most of the knives above and love several of them, but if you are wanting something that you can seriously beat take a look at the Cold Steel Ultimate Hunter & the Emerson CQC8. I would say do yourself a favor and go with the Tri-ad lock. There is no lower maintenance knife lock nor is there a stronger one. The CQC8 has literally been stomped through materials and I have never even had to send it in to be adjusted. From your requirements, these may not be the best looking or coolest but they will perform the best. Hope this helps.