Help w/ buying IPHONE & PLAN?

Okay, I really want an iPhone. My dad and I share a plan on Metro, and our Android phones barely work anymore.

Would it be cheaper for us both to get iPhones with a shared plan --- or should we just make a separate plan for me and he'd stay with Metro? We're really low on money & he doesn't want to pay more than $50-60 per month.

If I got one, should I get the IPhone 6S or IPhone 6 (or another)? Finally, Which is cheaper: T-Mobile, Sprint, or AT&T?

Basically, what I'm asking is what's the cheapest (1) IPhone, (2) Plan, (3) Provider, and is it cheaper for us to share a plan (4)?

Please be nice in your responses because I clearly don't know a lot about this.

The cheapest service is probably straight talk, but its also slow, you get what you pay for.

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