Which is better, The iPhone 6s or iPhone 6s+?

I'm a 16 year old girl and am 5 4" so am rather short for my age. I have the choice of using my mums old iPhone 6s (with 12GB) or my step fathers old iPhone 6s+ (with 32GB). Both are broken so I have the choice of fixing one of them. For my size would the 6s+ be too large?

You're tall. Why are you acting like your short?

6 s Plus is the perfect size, and newer. Especially since the 8 plus and 7 plus etc have came out you shouldn't spend money on an older and smaller phone. Only issue is the plus cost a little bit more to fix, and if you ever crack the screen again then obviously it would cost more than fixing the 6s screen. But personally I repaired a broken 6s battery and now got with a 7 plus and never going back to a smaller phone!

I phone x much better.
iPhone X is a smartphone designed, developed, and marketed by Apple Inc. It was announced on September 12, 2017, alongside the iPhone 8 and iPhone 8 Plus at the Steve Jobs Theater in the Apple Park campus. The phone was released on November 3, 2017.