Is tbere any major différence between thé iPhone 6 and the 6s?

Whooppeee is Xmas again and my daughter wants new 2nd hand) iPhone… 2 years ago almost bought her 5 before i réaliséd that it was 5s she wanted ( cos thé 5 sucks?)
And I don't want to screw up this year…

https://www.gsmarena.com/...hone2=7242

The 5 was fine back in its day.