I've only started using Strava since I got my Lezyne GPS unit because it automatically uploads rides to there.
I find Strava clunky and visually unattractive - but maybe that's because I'm a long time, very happy, and paying RwGPS user. Route planning, recording, decent app, squashed bugs, and, yes, segments too.
Although RwGPS will pick up disgruntled Strava users, the lack of third party plug-ins will be a dissapoitment for some. And, if Strava claim they can't make money, then I can't see how RwGPS can either, which bodes Ill for the future.