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The differences aren't that big unless commuting makes up most of your weekly volume and if that's the case then you're not actually training and don't really need a power meter :P.
It's also quite easy to adjust an estimate if it's a fast commute vs. a slow commute. But, by all means add more powermeters to your bikes, it makes them cheaper for me in the long term.
It's been years since I trained properly (or even improperly) but I find the data interesting, and if I ever find the time to start training again I'll have a large volume of data to go from - that may be largely or totally irrelevant, but hey, I'll have it just in case.
The differences aren't that big unless commuting makes up most of your weekly volume and if that's the case then you're not actually training and don't really need a power meter :P.
It's also quite easy to adjust an estimate if it's a fast commute vs. a slow commute. But, by all means add more powermeters to your bikes, it makes them cheaper for me in the long term.