I would tell them it's about the money and being closer. Of course you'll want to word it elegantly. Try something like I feel it is very important to balance both work and personal life. A good balance provides a stronger, more efficient employee capable of dealing effectively with the day-to-day job challenges. To have this balance it requires fair compensation from the employer which I do not feel I am receiving at my current employer. I feel TD will offer fair compensation. In addition TD is closer to my home which reduces my daily commute and once again contributes to a balanced life style.