You prefer the default apple screenshotting app over clean shot x? Really? Have you even tried clean shot?
I haven’t personally used clean shot X, but a tool has to be way, way, way better than the built-in default to get me to change. It doesn’t matter what clean shot X can do better; clean shot X loses because se it isn’t going to be on every Mac I sit in front of.
Better screen recording would be nice but I do it rarely enough that Quicktime is fine. If I did it more I'd definitely have to find some other solution.
All the marking up and such—well, there are many reasons that Preview is possibly my favorite single program on Macs.