Just bought a new (to me) iPhone 6s Plus!

Was able to buy it local & run the imei on both icloud & imei lock to verify it was clean, which it was.
Phone's near mint in box. Silver, 64GB. I was wanting Space Gray, 128GB, but i'm still happy with the deal I got.
To my surprise, it's running iOS 9.3.2. Now the big decision is whether or not to jailbreak or just upgrade to 10.0.1.
Suggestions?