Ok, I'm being somewhat cheeky with the subject title...the resuts are totally unscientific & subjective, but I've just had the opportunity to try both subs side by side in my house...surprisingly (to me at least) the 1994 original REL Strata 1 wins - no contest (again, to me at least). I should just say there that I have no brand loyalty...I'll buy whichever gives me the best perfomance within my budget! The REL bass output just seems more 'all enveloping' and appears to output deep bass with with ease. Sure I can get the XLS200 to go low too, but it's as if the unit is being strangled & fighting to output similar levels & with the same authority. Ok, so the XLS is diminutive & the original strata double it's size, but the REL only has a 50W amp (against the 200W of the XLS200). I'm a bit torn now, my heart says the REL, my wife says the XLS200 (she's used to things that are below average in size ). Pack your bags woman & be off with you...you've ruined my (home cinema purchasing) life!