I've tried different threads recommended by notable hand quilters and they all seem to work just fine - Aurifil, Wonderfil, Superior in a variety of weights. I've never had any of these break or fray. They just have a different feel and appearance on your project. I think it's just like needles - the best one is the one that works best for you.
I heartily agree with NJ Quilter - Thread Heaven is a wonderful product that I would recommend using with whichever thread you select. It surely makes a big difference by keeping your thread de-tangled. I also keep my thread length to 18-24" max which works best for me.
Would love to see your handwork!