The advice I gave to both my sons when they started dating, was it was always a good idea to ask themselves if they really liked their girlfriends as well as just fancying them. The best basis for a lasting relationship is being friends with your lover.

This might sound crazy. When I had lived in Pennsylvania I had known 4 couples that were happily married in all 4 cases the wife claimed to have hated their husband prior to falling in love. In one case the wife had hit the husband with the car that was before they were a couple though.

If I had to choose one or the other, my first choice would be best friend. The lover part would be the bonus.