Should I upgrade or do a complete new install

I've got a couple sites I started with 2.0 OP, but gave up on them.

I'm thinking to give it a go again.

In order to upgrade to the 2.1 119 build would it best best to just start over 2.0 build or upgrade?

There are no site theme changes and the old content is pretty worthless at this point.

I did get the sites up and running, but had enough tweaky issues I thought to wait a bit.