ORIGINAL: Jeffrey H.
As GB, I could make Hurrican I but not Spitfire I, and I can research generic fighters IV I think but I cannot really know right now how good each of these is. Is it a general guideline that the specific units are better in characteristics than the generic ones ?
As France, I noticed that I have the D520 but I can also upgrade to generic Fighter III's I think, (or maybe II's) which makes me wonder which is better.
In researching an upgrade is always better. The research is "Generic" but sometimes the result of the generic reseach is a specialized item.

