The Motif guitars are stereo and softer, the FA nylon guitar sounds very direct and, I think, quite realistic, but not as ""nice and soft"" (there we are again) as the Motif.
I like the FA acoustic bass much better.
The FA strings are very bad first, then very good - for the first patch they clearly didn't take the SN-A string sections, later they mixed them in. The Motif strings make much use of the solo voices, which I don#t like again. But this shows that it's a very subjective comparison again, it depends on which string voices you choose and mix.