Before starting I must mention the website Distrowatch here you can get information about all the linux distributions.
Now starting over it depends on what kind of things you wanna do with your system.
If you wanna explore the system like hacking or something : Kali
If you want everything installed system and don’t want install basic software : Mint
Windows like system : Zorin
At last you want overall package go for Ubuntu. Though it seems very heavy for simple machines due to unity desktop. I think for this much is enough.
Want any other suggestion? Do comment.