Hi and welcome.
Well, not much to add - sorry, never tried the MQ but as Philly says, they are an obvious choice if you like the proven SG/P90 combo. About the RiffRaff : they are quite bright, very open, dynamic and punchy 'buckers. I've had a RR bridge on my own SG, finally replaced it with a Abomb because I wanted something more modern but I was so impressed with the RR that I bought a full set for my (semi-hollow) Hofner Verithin, and I can tell you both neck and bridge are plain great - should I say "amazing" ? - and that they are spot on if you want this prototypical SG tone.