Get an SV. It will blow both away at half the cost. Plus you'll be getting a bike with known issues, a plethora of online support, and a ton of aftermarket parts. Getting the first cut of the 300 or 500 could mean waiting to mod it out. There is so much you can do with the sv it's too much fun.
Just my biased opinion but if I had to actually answer the question you asked I would say 500. I still wish the new ninja was a redone ex500
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