Harriet, I don't have either of those cover stitch machines but I do have the brother cover stitch. I like it as it is simple to thread and does what it does nicely. It doesn't even bother me that I have to manually release the thread in order to get the fabric out from under the pressure foot. It is easy enough to do. It is very reasonably priced also, I paid under $400 shipping included and it came with 12 cones of thread and 100 needles.
Debbie Cook has put her comparison chart back up on her website so you might want to check it out and Pattern Review has a lot about the different cover stitch machines.
Here is Debbie's site
http://stitchesandseams.blogspot.com/ just click on the cover stitchstuff button.
http://sewing.patternreview.com/SewingD ... s/forum/43 You may have to join to see the older posts but it is free for the basic membership.
Good luck.