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the level 10 mod you're talking about is a opening up of the passages inside the valve body to flow more fluid (inherently allows a change to shift characteristics - and claims of cooler running).
the small car mod is effectively a change to the voltage seen by the transmission control unit (based on manifold vacuum), which in turn controls the pressure coming from the pump - for crisper shifting.
I personally have no experience with either, but I would think the level 10 solution to be the more elegant.
IMHO it would be even more interesting if Level 10 offered a manual valve body conversion (like I had on my MOPAR 727B Torqueflight some 30+ years ago) yielding positive control over gear selection regardless of speed/throttle position.
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