First thing I try is sparkalloid. Second thing I try is Super-Kleer. Third thing I try is bentonite, then sparkalloid. That last one takes longer and costs you more lost volume. If I was less of a cheapskate, I'd probably use super-kleer all the time.
Bentonite and sparkalloid do the negative/positive charge thing, just like super-kleer (a 2-stage fining system).
Sparkalloid tends to be a little more "fluffy" and doesn't settle as compactly.
Tip: do all this warm, if it's not clear in a day or two, put it in a cold place (I use my lagering fridge) and let it sit.
Filtering is very rough on a mead and can strip flavor, color and aroma. Try to use time first, finings second.