I shot Olympus OM professionally for many years, many years ago. I now use Canon and where pratical I still use my OM glass over L glass on the Canon's with an adapter. The problem with the current Olympus line is it is limited. As a pro you do not need to be limited by products made for your system.
I chose Canon because it had the widest rang of equipment I might use. At that time Nikon's offerings were limited and behind the times. Only within the pas year or so has Nikon started coming out with state of the art equipment.
Another reason for choosing one of the big two is equipment rentals.
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