I've found, the more fuzz the better. A spark-lite spark is tiny and in order for it to ignite any type of material, whether it's paper, cotton, whatever, it needs to land within microscopic strands. The issue, I believe, is the immediate need for oxygen. Of course adding fuel to the tinder composition (like wax, fat-wood etc.) will always help a great deal.

If you are going to try wood, don't cut curls to start (they can be on the side waiting for a flame to start) instead, scrape the wood into tiny curls or strands. Starting a fire is a lot of preparation of the materials first (all of this can be found in one nice old dry birds nest) and then using your sparking device. Practice practice practice.