Well Tess has the main factor covered, don't discount one other. Where do you live in relation to the units? One unit is located In Kingston , the other in/ around Owen Sound (IIRC)
How close are you to each unit? Basically how far will you have to commute to either unit?
It may not seem important at first but it may be a factor in how often you can parade, and therefore how much you will get out of your service and not just for advancement.