Thanks for all the input. I think Strava is going to get the nod, rather than running both apps. I like some of the features of Strava just enough to go with that primarily. I can "log a workout" into MMR if I want a backup to store my ride data, and to get the weekly email updates, as well as the monthly progress updates as well.

I particularly like the segment tracking on Strava and the social feed to see what others are doing in my area and as a comparison to my own performance.
However, at the end of the day, I just want to ride my bike, enjoy it as a great stress reliever and enjoyable exercise option. The apps are just a nice addition to keep tabs on my progress.