My two’penneth.
To set the scene, I race cx, I weigh 73kg, I’m old school and I’m a self confessed weenie.
Racing. Tubs are great, lower pressures gives better lap times. Simple. The downside is that unless you can afford at least two (3 would be better) sets of wheels and tubs at many races over the course of the season you will be on the wrong tread pattern for the course.
Training, Club Runs, Etc. At some point you will puncture. At that point you will wish you had decided to run clinchers with a spare tube in your pocket. I know this. Yes you can ride 22 miles home on a flat tub. I know this. But would I do it again? No.
in summary, for racing, never more than 2 miles from the race HQ tubs for sure. For anything else clinchers.