Pitlock are nice. The day I lost my Pinhead key and opened one with a flathead and a hammer in less than a minute was a little sobering. They’re still better than a quick release.
For sure, nothing is 100% secure (and even with multiple U-locks an angle grinder will win out after a while). I've had a good experience with hexlox so far - they are super hard to remove without a key. Haven't had any theft issues in multiple years of parking around San Francisco.