Use both triclamp and RJT in the brewery. RJT are a bit obsolete due to being a potential blind spot when cleaning but got a second wind when sanitation processes (chemicals especially) got a bit better. RJT are arguable simpler, pull in on the threads and self support whatever they are attached to and require less manipulation which is important, especially in tight spots or hanging off a ladder, but have drawbacks. The o-rings wear out (minor detail) and they can require not an insignificant amount of manual strength (big ones especially) to do up and remove by hand. It is no fun when by the end of the week your arms are burning and your grip strength is failing. We've spanners, but they are never where you've left them! Triclamp can in theory be done up and removed by anybody irrespective of strength and are very easy to clean and inspect, but require pretty flush faces to seal with plenty of slack on heavy hoses and don't like being put under sideways pressure so they don't tend to support what they are connected to very reliably. Most gear comes with triclamps as standard now, but because RJT is on so much legacy gear having them retrofitted/adapted etc is another day in the office. Because I'm stuck with a mix I use a mix, but if I had a choice it'd be triclamp on everything. Triclamp also has the benefit of being mass produced and as such fittings might as well be free. Nearly every RJT gate etc must be made up for us bespoke. You've got to make friends with a good stainless welder/machinist. Brass, copper etc are all a waste of time and more trouble than they are worth. The chemicals we use eat them, we've not time to babysit them and the last thing you need is equipment failure messing up the work day and risking the beer.
