Here you go another opinion.
I owned briefly an SML standard (a Rev. D without rolled tone holes) and an SDA.
While I read in many instances comparisons of both of them to MVI, I got to say that in my experience the better success of the Mark VI in the sax history is no mistery to me and not related just to the better marketing and resources availability of Selmer vs. Buffet and especially SML.
Having said that, the SML is closer to the Selmer sound, if that it's what you are after, the SDA in my personal opinion resembles more a Martin or a Buescher 400 and the unit I had was very spread sounding, quite more than my Martins too. There was a darkness that justifies the often heard adjective "smokey" for those, not so much power (now you might be spoiled by your S20) and overall a good feeling of a reliable instrument, if not so distinctive.
The SML had a very satisfying high register, really punchy and responsive, though it has a really challenging left pinky cluster unless you have really big hands: I thought I could live with that but.... no. The sound was more satisfying to me than the SDA, but that it's too much of a personal assessment. I'd say more focused for sure and probably more versatile. It could get really loud while the SDA had troubles there, though better players than me might obtain better results (still doubt they would pump the same volume as with the SML though). I never found the bell key notes as easy as on vintage american saxes.
In a nutshell, I'd pick a SML anytime over a SDA. Just don't think you are getting a dressed down MVI, since they both are rather different and, to me, less appealing.