Both are excellent fire starters, neither is perfect. We're not going to hold our breath. The experienced outdoors person will not have any trouble operating either fire starter. We like the better instructions included with the Spark-Lite, which would be a boon to the inexperienced, though as noted, there is room for improvement. Anyone who would need the instructions for either of these fire starters will likely need all the help they can get.
Illustrations accompanying any textual instructions are always an advantage for the novice.
The instructions provided with the BlastMatch are barely adequate and in need of much improvement, both with regards to legibility and content. While there is no way to package the instructions within the BlastMatch itself, they could at least do a much better job with the ones provided. In a survival kit they could be attached to the body with tape or rubber bands, or the BlastMatch left packaged in its box with the instruction sheet. Comparing the tinders, the WetFire is, by a significant margin, the most effective, but the Fire-Tab is no slouch, being perfectly adequate in our experience. Obviously, the packaging and storage requirements of the WetFire come into play in some circumstances, whereas the Fire-Tab is more accommodating of storage, both in terms of space and abuse.