Hmm, depending on your uses it seems like a toss up. Personally I would go with the 8150 and overclock it as much as possible. Clock for clock, Single threaded is better on the 6300. With a slight overlock, the 8150 would be faster single threaded than the 6300 stock.
I would get the 6300 purely for it's significantly less power consumption and better per-core performance. Based on what you plan to do with the chip, I doubt the extra cores on the 8150 would help you at all.
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