I haven't had the chance to compare the new "old world style" American malts to the traditional European ones, but I find the American to be sweeter and more less grainy. That being said, my favorite are the Avangard Malts. I feel like they are grainer and drier even than the Weyermann.
Definitely something you'll have to try in a horizontal tasting as its very difficult to tell a difference with any time between. I'm fortunate to have had the opportunity while working at a homebrew store to sample the malts raw, just chewing them up to get the flavor. That really helped me get a feel for what malts taste like what.