Vaginal birth or C-section?

Candice • First pregnancy at 39. I'm due Aug 26th, 2016. It's a boy!
I'll be 39 at the time of labor and I'm a first time mom. Would you recommend vaginal birth? Or C-section? My doctor said it's really up to me, and I read both pros and cons of both. Any advice would be much appreciated. 
Thank you