The Commerce City hub is the biggest in the state and has the most shifts so you will have more options on what hours you are looking to work.
If you work out at DIA, you might only get 2 or so hours a day because of the small amount of volume. If you have another job or school and are just looking for seniority and benefits this might be a good fit.
I hear Englewood is pretty much guaranteed 5 hours a working preload. Not as many options as Commerce as far as the number of shifts but a decent sized operation as far as Colorado goes.
They are hiring drivers now with only 2 years seniority and they are burning thru the the bid sheet. I'm hearing similar stories all over the state as well so if you are looking to drive eventually, it seems like a good time to jump in. Either way, it shouldn't be hard to get hired.