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Boomtubes are cleaner, a bit quieter, and less obnoxious. They have a little bit of packing material inside them, but still sound nasty.
None of the axle-backs will have any performance difference. Do not factor performance into this decision, because you will be very disappointed. Also, like SLPs, Boomtubes will not bolt to your 3" over-axle pipes. Almost every axle-back is made for the 2.5".