I use both, and I've recently found that after painting a couple of dozen minis that I can paint most of a mini in an afternoon. When I started I never would have believed that.
But I also use counters. It's not easy (or very satisfying) to paint 2 dozen goblins, so counters round out the opposition nicely. I've also recently found a great way to store counters: in the craft section of Walmart I found the embroidery thread section. For storing your thread they make little ziplock bags with holes punched in them so you can run a ring thru them, and make a little binder of bags. Each counter goes in a bag, and suddenly I have a very nice way of storing the 450+ counters from the Counter Collection...
PS