I'm a vendor that sells camlocks and triclover fittings. I make the same profit on both so I have no economic motive to push one vs the other.
Triclover: Worldwide standard, more sanitary and definitely easier to clean, bulkier, more expensive, and not the easiest to make/break connections if you're moving hoses throughout brewday. Caveat, your system will not really be sanitary if you use a bunch of threaded to TC adapters, if you use threaded ball valves, etc. In other words, unless a very good welder puts TC ferrules into your vessels (or you buy vessels with TC already) and couple those with sanitary butterfly valves you end up fooling yourself into thinking you have a more sanitary system.
Camlock: Also a worldwide standard based on a milspecs as long as the manufacturer cares about conforming. All SS camlocks I've held in my hands that have been imported in the U.S. from China work together. 99% of all camlocks available in the brewing market come from the same exact importer from the same factory in China. They work.
Yes they are threaded connections, which in the long run are just a few more threads in an already thread-heavy homebrewing system. With typical clean in place methods, you'll get no more nasty gunk in the threads than you would in a typical ball valve (non sanitary butterfly valve that is). All of this stuff is hot side anyway so unless you're a slob with your gear, you'll be fine.
Aside from a couple dissenting views on this, camlocks are easier to connect and disconnect with regularity. The silicone gaskets are captured so they don't roll under the brewstand. They are easily replaceable also for about $1 each.
Long story short, I put camlocks on my brewery some 5 years ago and never looked back. They do exactly what QDs should do, in stainless and silicone, for an unbeatable price.
Anecdotal: 90% of people that stopped by our booth at NHC raved about camlocks. 5% said they like TC better. 5% said they use plastic or brass QDs and they hate them but couldn't afford to change them out yet.
Price? A mated pair of male camlock and female coupler with high flow barb is about $11 to $12. For 1.5" TC, assuming 1/2" NPT thread to flange, gasket, clamp and 1.5" flange to 5/8" hose barb, that mated set is close to $36. If you replace the 1/2" NPT adapter with a weld on ferrule, you save $12 but add about $30 in welding labor.