I love almost all threads for FMQ - from poly serger thread to 30wt cotton to 3-ply embroidery thread. Old Coats and Clark, ThreadArt, Superior Threads, Connecting Threads, Dual Duty, Star Cotton - love 'em all. :)
I just started learning to hand quilt using a Barnett lap hoop and the "Aunt Becky" method and I bought some Americana glazed hand quilting thread for that - I really like that stuff, but I don't have anything to compare it to other than the Dual Duty I used years ago and that was fine, too.
Try lots of stuff for FMQ and see what you like to work with. :)