I don't know about them "constantly" breaking barrels, I have a 2013 Czechmate which has had no issues, do you know what year your friend's is? How many rounds did he get on each barrel?
I've shot CZ Open guns for four years with barrels from all models (they're all made basically the same) and have never never broken anything except one slide stop on a well used Shadow I bought.
Between the CM and the GT, I don't think either is more or less likely to break although if a CM breaks it will be the barrel and on a GT it will be the slide. These are race guns, run 'em hard enough, long enough and things will break/wear out.
The reason I prefer the CM to the GT is the trigger, comp and the fact that the CM is tighter/smoother than any of my 2011s. The tiny two port comp on the GT is terrible, and the 12 holes require huge charges to make Major. The CM comp is not the best I've shot, but much better than the GT, on the downside it's heavy, but no heavier than a steel comp, steel grip 2011 and plenty of people seem to like them.
I would consider the Trubor, CM and GT in the same league with my preference being the CM, TB, then the GT. They're all high entry level race guns which will open the door to a custom build.