One thing to consider is what is available in your area. One of the reasons I shoot with Paul Buff stuff is I live in Nashville, so if I need anything I can just drop by the place and pick it up.
If you bought your own Profoto equipment and decided you needed to rent additional heads or modifiers, you'd be able to easily since you already have a source in your area. Never know when you're gonna drop something and need a flash tube quick, for example.
Just a thought. May or may not be a big deal to you.
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