Good question. The properties in Burlingame tend to run a but higher then Millbrae; however, the question is a little tricky, as I would think you are interested in net profit or appreciation over some period of time, and that would determined by your original purchase price.
All things being equal, a 10% gain on a $2,000,000 homes is greater then a 10% gain on a $1,000,000, right?
The catch; however, is how and what you do with the gain. If you were just selling, and walking away with your profit, great.
Millbrae and Burlingame are both great.