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Do You Really Need The Newest iPhone?
You should probably get it right now. Seriously, the world is praying for you. (Unless you actually like your phone. If so, good for you. If not, we understand.)
Your phone is outdated and probably doesn't work too well, so you should upgrade.
Even though your phone isn't extremely outdated, it probably doesn't work as well. Therefore, you should consider an upgrade.
Your phone is one of the newest models, but if it doesn't work like it should, then an upgrade could be beneficial.
You might really want the newest phone, but yours is already amazing. If you're strapped for cash, stick with the 6 for a little bit longer.
Unless you always NEED to have the latest phone, yours is already one of the best out there. You should keep the 6S for at least another year.