I know the Avalanche will win in SQ, and the SX in SPL. BUTTT to what degree? How much louder will the SX get? and How much better would the Avalanche sound. (i know the avalanche is not available right now, but getting one is not an issue)... both would get their RMS values in ported boxes (probably around 4cu ft. @ 30hz)
Get the SX you wont be able to tell the diffrence in the sq as much as you will be able to hear the diffrence on how loud the sx will get. Also i like Re better so im bias.