the comparison was on much fuel was consumed/min between the Wren and the Flea... though they are a bit different, the size of each seem relatively close for end use.... you may get a bit more of the wren but in a smaller jet, it may be a bit much. and vise versa. i dont think the comparison is ment to degrade either product, just show the unknown differances between them... which for me personally, could help determin which is a better fit for a build/conversion.
after all, this is what free trade is all about... design it, build it. market it, sell it. fly it, crash it, rebuild it, start all over...... you ll still end up with as much time and money ivested into either.... no bashing here. just cold hard facts.

no offense intended.
Tim