SO i am buying a jeep wrangler but i needs help deciding on weather i should get a 4cyl or 6 cyl?

i know six cylinders are much better than 4 cylinders when buying a jeep these days and iam bout to get 6 cyl one but i've also heard that 6 cyl are much more expensive than 4 cyl ..is this true and if so by how much? estimate like a week?