Difference between paying $75/month and $1500

Hello, I’m still new here and I’m interested, for buying a Unity licence (for PC, Android and iOS) I can pay $75 monthly or $1500, in the case of the $75 I readed that I don’t own the licence since if I stop paying it will go back to the free version, but I don’t know what I’ll get if I pay the $1500

Sorry if my english is bad

You get… Unity Pro

http://unity3d.com/pages/why-go-pro

Paying $75/month is a subscription. Paying $1500 up front is not a subscription.