First of all, i'm glad the OP says "not to rail people for opinions" and doesn't say "favorite" when the previous thread says "worst". Haha.
Second, this decade has had quite a few very cool pop hits, and of all of them, I think that my pick for best would be no other than Rather Be by Clean Bandit featuring Jess Glynne. While it's a song about love, something that has been done quite a bit, it just works. That beat and the violin are very well composed, and it's about how the singer is perfectly wanting to be alongside her lover no matter how bad. Really, i've listened to this so many times and cannot see myself getting tired of it.
Too bad its successor, Real Love, hasn't become too much of a hit, although it has come on radio a few times recently.