Honestly, I don't know. After his incessant melodramatic whining in "Treat You Better", it's pretty much a coin toss as to which of the four artists of subject here would be the most tolerable for me to hear right now.
... I mean, Don't get me wrong. I of all people would certainly be approving of the perceived base principle of this song: be nice to girls, especially the one you love. But let's be honest; what this particular Shawn Mendes song amounts to is this: "Girl, we need to talk. Someone finally needs to intervene in your life and tell you this. I should be the one getting a little on the side with you, not him." (To put that mildly.)