I was at the sporting goods store today, and noticed they had Fire Lites, so I figured I would grab one and compare it with a Spark Lite.
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Next, I grabbed my trusty leatherman and broke each of them apart (there goes $20

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Paul, thank you for sacrificing the sparkers and sharing it with us. It's good to know how things are put together.
JI, what characteristics about these two models has your interest... the size... one handed spark capability...
something else?
If it's size only, you can get a ferro rod and striker combo with about the same size package and get a lot more spark per strike.
With the UST Blastmatch, you get an enormous amount of spark with one hand. The rod rotates in the casing so you don't wear out one area.
I've got a few of the TAD Survival Sparks and like them for what they are, I also have several BlastMatch firestarters and others. Just wondered why you are limiting choice.