I seem to find Tru Flight to be a little better quality in the 3" & 4" lengths. Of course the feathers are the same, but the Tru Flight quills seem to be a little flatter and a little thinner than Gateway. This makes them more consistent and easier to glue on. Gateway & Tru Flight seem to be equals in the shorter lengths.

It may just be the luck of the draw. Maybe I've just been luckier with Tru Flight, but I use them when I can get them.

I've never tried the AMG feathers.