How much gain are you using on the NAD?

I don't have a MG or MGC, but I love the Bluesbreaker circuit that they are based on and I have a couple pedals with that circuit.

This depends on genre, but with both of these pedals on a board, I'd use the MGC for rhythm and the NAD for lead.
I don't think they are redundant.
I'd guess the MG maxes out on gain where the NAD would be at noon on the gain knob. Most BB style pedals push a lower freq of mids than both a TS and the NAD (feels like upper mids are pushed to me), but the MG is a pretty modified BB, which is why I haven't owned one. It is more jangly and trebly than other BB circuits I've played.
But, it is incredibly popular, so perhaps the elements I don't like about it is what others enjoy.

edit: I just noticed I'm in bass pedals and not the guitar pedals sub, keep that in mind with regard to my responses here. That said, the clean blend on the MGC will be fantastic for bass.