I am a little bit confused which Ubuntu to install on my pc. I used 16.04 before and I was satisfied, but now I checked the Ubuntu page and there were 2 versions available there, Ubuntu 16.04.3 LTS and Ubuntu 17.10.1? Which one do you guys suggest?
Ubuntu 16.04.* is the most recent Long Term Support version. This is the most stable, least subject to change over its lifetime, and is supported for five years from release (until April 2021). Ubuntu 17.10.* is not LTS, and its support will end in July 2018, with the expectation that you'll replace it with 18.04.
If you like the idea of having the absolute latest stable version, install 17.10.1 and be prepared to replace it in a couple months. If you like the idea of having the same version for a prolonged period (and not having to re-learn your way around every few months), install 16.04.3 LTS.