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OK, so let's say I have a 300mm lens on a Micro43rds body (so 600mm FF equiv) - and the camera shoots at 20megapixels. Now let's say I have a 500mm lens on a FF body and the camera shoots at 45megapixels. Would the FF get a better crop into the image vs the M43 in terms of quality? Seriously...

I am between the D5300 and the D7000, obviously. My budget is up to 700€ I have found a used D7000 with 80.000 clicks with 500€. Please help me decide. I want it for both photography and video. Thanks in advance.