Which of these would be less expensive and help me lose weight faster>?????!?!?

I was thinking about either signing up for a Kick Boxing cl or going to a gym and getting a personal trainer. But I heard the personal trainers were pretty pricey. Could I get good results from Kickboxing if I go 3-5 days a week or should I just try a personal trainer?? Any suggestions would be greatly appreciated! Thanks!! ^_^