I almost always use C&C with no issues at all. Gutermann is just okay in my machine, nothing special, though I just went through hell with Mettler and ended up giving it all away.
Sometimes you get what you pay for, and sometimes you just pay. It's definitely worth experimenting with each brand to see how it goes, but at the end of the day use what satisfies you without killing your budget. For me that's still good old C&C, but there is no wrong answer.