I've already bought HWLG, but, being a long time, (and long suffering) TW fan, will probably eventually buy Napoleon-TW, if only for the campaign, excitement, and eye candy.
But I'm very cautious after the debacle of Empire, which is still barely playable, especially in SP, even after one year and several "dubiously" useful patches.
As Gunner24 has said, the modders will undoubtly help Napoleon, (hopefully), as they have greatly helped Empire.
Where as we know that JMM will continue to improve an already good HWLG, definitely!