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For Flex ATX, one important consideration is the noise issue.  One main drawback of a Flex ATX PSU is that it is usually noisy (compared with a SFX PSU).  This is almost true for the stock fan of any brand, AFAIK.  But, of course, you can mod it with a Noctua fan.  But, nonetheless, it will not be as quiet as a SFX PSU. 

For gamers, this might not be annoying because gaming music (from speakers or from headphone) often overwhelms the PSU fan noise.  But, your main use is video and photo editing, I imagine you would appreciate a more quiet background while doing your job.

My 2 cents.