I like the MGWT when I'm going to be doing toning in sepia or brown toner. It's the only paper I've seen that can give me a chocolate brown when I want it. It does have kind of a vanilla base and I could see why people don't like it when they aren't after a significantly warmer tone. But like 2F/2F mentioned, Ilford is extremely proud of that paper. Way too expensive.
If you want a chocolate tone on other responsive papers try lower dilutions (higher concentrations) of brown toner for a shorter period. Hit the print hard and fast (10-30s), rinse for a few minutes, and then into HCA.
Stop worrying about grain, resolution, sharpness, and everything else that doesn't have a damn thing to do with substance.
I like a dark chocolate on some prints that doesn't go too far into the yellow. And concerning the OP's initial questions about wt developers, in my limited experience I've found the tonal differences to be very subtle among varying developers.