I've been very happy with the ZT 0350s I've owned. One disappeared out of my luggage when flying a few years back. I replaced it with another and would do so again without a second thought if similar circumstances arose again.
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I have an Emerson CQC7F that I like a lot.
https://uploads.tapatalk-cdn.com/201...5f25340599.jpg
... and a ZT 0620 Emerson (Elmax) that I like even better. On sale for $164...
https://www.amazon.com/Zero-Toleranc.../dp/B00ILFL66S
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So, I love Emerson's and Ernest is a friend.
But if picking a knife for EDC where potential defensive use is high on the scale of selection criteria - the Spyderco P'Kal is the best choice. The ball-bearing lock is extremely strong and does not interfere with any grip style, unlike the liner/frame lock mechanisms used in Emersons.
For every day users, general utility, I love my various flavor Emersons and Kershaw-Emersons. Despite having half-a-dozen or so of them, the Spyderco P'Kal remains my go to folder for EDC. Rarely am I found without it, and if I am, it's likely because I flew someplace and took a Opinel in its place (to avoid running afoul of legal problems).
The only things I would change is to switch over to 154CM or CPM-154 steel in the P'kal, because I find S30V to be a pain to sharpen easily. And I would swap the silver pocket clip for a black one. Fortunately, the latter is available from Spyderco for a few bucks.
You need to up your sharpening tools, Rob. It's part of the fun. (Except when it isn't.)
That's not actually untrue, I do need a better set of sharpening gear. I also find S30V tends to chip and get toothy around the edge more, where various flavors of ATS34/RWL34/CPM154/154CM will roll and thus I find those steels easier to fix. Because it never fails, that I will goof up an edge or tip somehow with a daily carried knife.
Diamonds followed by ceramic...or...Shapton Glass...or...Venev bonded diamond will all work well with S30V and the diamonds will work with all the higher Vanadium carbide steels like S110V, CPM-20CV, S90V etc etc
You can also use silicon carbide (Norton Crystolon) on S30V.
There are more than a few steels out there that will make you swear a blue streak absent the right hones. And sometimes even with.
ETA:
@RevolverRob Here's a thread worth looking at on bladeforums specifically regarding sharpening S30V