I was inclined to 10mm and even painted a few but I did find the ranges to be too limited in variety for the painter within me. I did paint up some Old Glory Napoleonic 10s and what I found was that the visual was about the unit and the flag rather than individual figures. There strips of 5 figs are based very tightly in march attack pose together which gives a good impression of mass. This had a very nice look on the table.
With the release of very well sculpted Blue Moon 18mm Figures I wondered if I could achieve a similar look to the 10's with these larger figures. Pictures are below and mission accomplished I think. This was a bit of an experiment but I quite like the result and can see doing more of these. The variety is there, the detail is there, they are relatively cheap and take much less time to paint than the 28s....at least they would with some practice.
Below are the two battalions of IR 17 Regt Manteuffel, each with 3 bases of 6 figs. This is roughly equivalent to 750 infantry per battalion.