Ubuntu is good as well and probably better known for possibly being around a little longer. The main difference is that there's a company behind Ubuntu running other products whereas Mint is backed solely by individual developers working in the spirit of free Opensource software
One of the good things about Linux is you can download as many flavours as you want to and test to find out which you prefer, without even installing it. All you need is a 4GB flash drive and a download and within a few minutes your machine can be running Linux without the Windows system even knowing about it. There will be in icon inviting you to install but you don't have to.
When you shut down the system, you start afresh next time but when you've made your decision, you can accept that offer of installing. If there's, say, 10Gb of free space on your hard disk, you can install on to that space and have a dual-booting system.