Xbox Biggest Loser Cal Counter vs Wrist Watch Cal Counter

chrymyrs

First just let me say this....I do NOT have the $$ to go out and buy an expensive chest strap hrm. I am a stay at home mom on disability.

Okay...I have been working out to the Biggest Loser on Xbox for a couple weeks now, and going by their "calories burned" counter. Today I worked out to it using my Sportline wrist hrm. The calories are very different between the two. Which should I use?