If you have a spare usb stick, the cost to trying them is only the download time. Each is capable of the same things, the differences are purely aesthetic. So try them out and see which you like best. Or install all three and switch each time you login.

You actually don't know the true cost until you learn the quirks of the UI, how it handles proprietary drivers, upgrades, the packaging system, how up-to-date and complete its packages are, etc.