Whats a better career: Sales or being an elementary teacher?

I was granted two offers yesterday: A teaching position for an elementary school K-8. And a career working for a big company selling advertisements for exotic cars like Lamborghinis, Aston Martins, and Bentleys. The sales package is 30k permanent base plus commission. Teaching is 36k a year plus pension and benefits. Sales is a always a grind. No sales job is fun. Must meet quotas and deadlines. Sell, sell, sell. Go to trade shows in Las Vegas. Some travel is required which I dont like. Constant deadlines. I could make 60k a year maybe more. But I dislike telephones and office cubicles. Teaching is more related to my interests. Summers off, writing, research, independence, instructing others---but the pay is low. However, I get a pension after 20 years. Working for govt. is good. Im a male(39 y.o.) So I will retire at 59 with pension. But dealing with occasional bratty kids, time constraints, and politics. I hate making career decisions. Whats your opinion?