As some of you know, a few years back I literally inherited a whole clowder of cats. I did a lot of research here and other sites I've since forgotten. The general consensus seemed to be that the best machines were Filter-Flo's and Maytags with the filter in the agitator.
Maytags were judged better for debris that tended to float, such as pet hair. Filter-Flo's were better for anything that tended to settle. There's a big caveat, however. Maytags only beat Filter-Flo's if washed at a full load, due to the filter's location high up on the agitator.
What I got from all the reading was this: If your primary concern is pet hair AND you generally wash with a full load (i.e. highest water level), go with a Maytag. Otherwise, you're probably better off with a Filter-Flo.
Somewhere there's a thread which mentions the types of debris that float and the types that sink.
That said I have 2 notes:
1. My mom has always had Kenmore's (currently a Series 80). They all had 'self-cleaning' lint filters and all did a great job at removing pet hair.
2. Yogi's Avanti has a manual clean lint filter with very fine mesh. It does a fantastic job at catching lint. It's available in various sizes up to 3.0 cu. ft.. Remember, there's no agitator so you can cram quite a bit into those machines and still get good turnover. Link attached.
I'll now turn this over to those more knowledgeable that I to expand on and correct the info above.
Jim