I'm not sure the brand is as important as the type. There are pellets, liquids, powders, some sawdust looking stuff and now blocks, available in the market.

I really like the way the pellets get the product right into your target areas, at the dosage you want. Something about how they just wisp away into muck! And it works.

I haven't the brand I like advertise here lately, so I won't mention their name.