It will also depend onthe airlines own procedure as to 'normally' use reverse above idle. Watch the aircraft land at say LHR and you will notice some airlines will always use reverse above idle, others will just stay at idle. One reason is that the extra cost of fuel, andwear and tear etc when using full reverse, is more than the cost of the wear on the brakes. The modern carbon brakes do not wear asquick as the older style ones, and with the cost of jet fuel.....
Certain airports runways will almost always require a fair ammount of reverse, (on the larger jets) EWR is one that springs to mind.