I've been using Runkeeper for the past two years, but am going to give Strava a try while I'm not training for anything in particular. The big difference between the two are Strava's segments and leader board.
I've made my first route during a lunchtime run yesterday: https://www.strava.com/routes/11012256.
There's a segment at the start that 161 Strava users have run 435 times (since when, I can't tell): https://www.strava.com/segments/961980.
I ran this route and segment with no thought to the leader board. Would I have run harder if I was aware of it going in? Maybe. Will I try to move up the board next time? I think so. I'm going to try to have a little fun with it, balanced by some critical reading about gamification.