Should I stay in sales or move to service?

I’ve been in used car sales for 1 year 8 months, averaging around 15 cars/month. But this month it’s August 8th and I haven’t sold a single car yet; last month I sold 9.

I’m thinking about leaving and applying for a sales position at Honda/Toyota, or moving into the service department for a more stable salary.

For the Honda/Toyota guys here — what would you recommend? Stay in sales and try a franchise dealership, or move into service?

Would appreciate honest advice!