2007 Jeep Wrangler or 2012-2014 Ford Mustang?

Alright, so Im 18 and I am searching for my second car. I took home a 2007 Jeep Wrangler yesterday from the used car dealership, but we havent bought it yet, we are just testing it for now. It is burgundy, with no body damages, great interior, MANUAL (I havent driven a manual before until yesterday when I practiced changing gears), and it has no problems. Also, 50,000 miles. The car is being sold for 16,500. On the other hand, I can buy an automatic mustang for around 20,000 on autotrader which has around the same miles. And is practically new. Which would be a better investment? Thanks ~

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