Re: Headline should read "Note 3 Twice as Strong as iPhone 6"
The reality is it's not twice as strong - if you suffered a force sufficient to break the iPhone (i.e. heavy fall onto a hard surface) it would probably be sufficient to break both.
Get Applecare Plus which now also includes accidental damage - up to 2 replacements over 2 years for a £55 excess on a £500-700 phone - so assume even if you do drop it into a pint or out of a window you can get it fixed / replaced by the manufacturer. Think it's about a £70 extra but over 2 years that's not even £3 a month.