Wasn't there a documentary on tv a few months back dispelling the myth that running shoes help stop injury's and having properly fitting shoes was the most important thing.
They asked all the big manufactures to back up claims their shoes prevented injuries but NON could prove it.
I think the conclusion was get the ones that feel the most comfortable.
I doubt it. There was some weird hippy-driven stupidity regarding bare-foot running and some companies started making stupid shoes that were more like waterproof socks, e.g. vibram they advertised that these were healthier for running, without a shred of evidence, and were promptly sued when a load of people injured themselves with the things.
When it comes to real running shoes, the reality is it is very complex
Running is a relatively high risk sport with high injury occurrence rates. There are many variables that correlate with injury, shoes being just one of them.
The human body is quite complex and various interesting things happen when you run on different surface, different shoes, different speeds, different distances. For example, if you run barefoot/minimalist shoes then your legs adapt to become more flexible and absorb more of the impact forces. IF you have highly cushioned shoes then your legs become stiffer to transfer more energy. Joint impact forces may not be too dissimilar in these cases but there are differences in for example bone stress in your feet.
here is a recent survey supporting the fact that shoes designed to correct over-pronation reduces injury risk:
http://bjsm.bmj.com/content/early/2016/01/08/bjsports-2015-095031.full
Anyway, your point "get the ones that feel the most comfortable" is exactly why one needs to go to a running store, get analysed and have a better chance of buying a shoe that is comfortable.