Now I'm really confused. Does anyone else know the answer to this? Being a big fan of Bob Glover I read all about how Elites don't run using the normal pattern of landing on the heel, but rather on the outside edge of the foot (ball-heel as opposed to heel-ball), and I set about trying to run this way, which I found I tended to do normally anyway.
Then I had a minor foot injury which I took to a (non-running) physio, who took me to task for not landing heavily (!) on my heels - after a while I gave that up and concluded that if you're going to listen to a physio make sure they know about running specifically, otherwise you're wasting your time and lots of money and possibly even risking injury to boot.
Finally I turned to RW for some common sense - but the only time they've touched on the subject of footstrike in the last 12 months was to advocate the heel-ball alternative. In fact this month, they suggest that the best running economy involves landing on the heel.
The only thing I have more or less surmised is that it depends on how fast you run which footstrike you use - but should one be working towards one or the other, that's the question? At the moment, I'm caught somewhere awkwardly in between. s.