VERY opinionated! You are going to get downvoted to heck for comments like that.
Try personalizing it: 'I found PHP much easier to learn for ..... but when I wanted xyz performance, .NET performance was abc.'
Give a use case / example where no code changes helped.
As others have said, apparently PHP7 is better than PHP5...
You are (VERY!) unlikely to change the minds of die hard .NET or PHP people, but you'll have a lot more potential with someone who doesn't know either...
Try personalizing it: 'I found PHP much easier to learn for ..... but when I wanted xyz performance, .NET performance was abc.'
Give a use case / example where no code changes helped.
As others have said, apparently PHP7 is better than PHP5...
You are (VERY!) unlikely to change the minds of die hard .NET or PHP people, but you'll have a lot more potential with someone who doesn't know either...