Wrote near all my school reports on Final Writer. Liked it a lot and was far easier than Windows 3.11's Word.
I have used WordWorth a few times as well as, at some point, it was the only available wordprocessor for the Amiga with dutch spell-checking. Didn't like WordWorth as FinalWriter had a cleaner appearance (handy while in interlace on a big-screen tv-set).
Later I've tried Amiwriter as well but the version I tested was not stable and not as easy to use as Final Writer.
Now to the recommendations... I guess at the moment all three should be capable to do your main wordprocessing. What might be interesting tho is the formats it can import / export, in case your documents need to be read on non-Amiga syste,s as well. Also, look at the minimum hardware requirements, it can give a nice indication of the 'raw' speed of the software.
