Hum maybe it's my lack of top-experience that is talking, but even if feeding your troops is a major issue when you're building a hammer, I would have thought that the most important factor would have been the att/time (then secondly the CC and finaly the resources). Maybe I'll change my mind after my next big server (probably the test), will see.
However if the main factor is, as you say, the att/CC, why do we see so many club hammers ? The roman are the one with the best ratio att/CC either in infantry or cavalry... And even for teuton, the axes would be much better for the att/CC.
EDIT : I just remembered something : I'm used to play on speed server, where obviously the crop are soooo much easier. That might explain my opinion.