Should I upgrade to an iPhone 6 or 6s?

For Christmas I'm asking for a new phone since my broken 5c is needing an upgrade. The 6 is much cheaper than the 6s but is the 6s an overall better phone? Or are they quite similar?

Quite similar actually, i wouldnt say its worth it for the 6s If you aren't aware of the differences, it won't make a difference to you. Get the cheap one.

If you aren't aware of the differences, it won't make a difference to you. Get the cheap one.