Well, I certainly love my Mainland mahogany tenor, but I suspect cedar is warmer. There is a kind of sharpish "tang" sound to the mahogany but I love the look of it and it is bright and clear. I'm trying not to catch UAS from you guys but if I do buy another uke, it would be a cedar concert Mainland.
I also noticed that you do have to wait for the instrument to open up. After I changed out of the Aquilas to D'Addario J71 strings, it has been going through a phase of some sort where the sound is a bit muted. First it was nice and bright and now I notice (with the increase in humidity here in late winter) that the sound is quite different. I'm going to strum it more as I assume the vibration will allow the wood pores to equilibrate moisture and adapt to the local climate here. The change in sound was quite dramatic.