I can't find any confirmed answer that a layman can understand as to the difference between the two protocols. I see a lot of speculation but no confirmed info. Do we have a easy answer to this? They seem the same to me, both use 2.4, both hop frequencies......??

Thx,
Steve

They do.

Unless you're really into the technical details, in which case you wouldn't have asked, they are both FM and both fly our models

DMSS hops the bandwidth of futaba.. It has a faster link. (Yes depends on your servo's) It re-boots faster..
It has true dual antenna diversity (2 antennas/2 chips (not one) the Processor in the rx's are of a HIGH quality brand..
So far I love it but I cant speak in comparison as I went to DMSS from other brands not spektrum..

DSMX use a Cypress T/R and DMSS use a TI T/R and both are FH-DSSS both therefor FHSS with DSSS like FASST/est.