Tamiya for Airbrushing, Model Master for hand brushing.
According to the MSDS on them:
Tamiya has three alcohols and one ether compound.
Model Master has two ethers and no alcohol.
I'm no chemist, but apparently three alcs and an ether evaporate faster than two ethers. Or at least the types used. Tamiya also has more water by volume.
We need Gip for the answers to this....