bus/train won't get you door to door, so you get further expense (monetary or social) at both ends (coupled with more pay-attention time). plus the added coordination time due to not wanting to miss your departure. i've done the bus, and i'd estimate it's more like adding 2hr of non-attention to the existing 2hr of pay-attention.
bus/train also requires packing/bundling and simultaneous handling of cargo, where with a car, you can just throw everything in the trunk/back seat at your leisure.
bus/train also requires packing/bundling and simultaneous handling of cargo, where with a car, you can just throw everything in the trunk/back seat at your leisure.