My favourite text editor on the Amiga was always Interword. It came on the CU Amiga august 1993 cover disk and is fantastic! It has a very sparse interface and just the features you'll need to get writing done. I wrote school assignments on my Amiga well into the late 90's and possibly early 2000's using Interword.
The company that made interword also made interoffice, but I don't have much experience with the other programs in that package. I'm sure they're at least competent.
I urge everyone to give it a try. I don't know if it's a full word processor but for creative writing or to just get in the zone and write it has worked wonderfully for me. I am actally using it to flesh out a game design at the moment. I still find it very easy to use.