Here’s a small post explaining the pros and cons of both vector and bitmap art.
- has a small file size
- the size can be changed easily without loss of quality
- it is what Flash uses
- it is easier to change
- is not as fast
- it usually looks like a cartoon
- runs much faster than vector art
- can achieve a more realistic look
- loses quality when resized
- is harder to change and reuse
In the end, the choice is up to you. Go with whichever one you feel more comfortable with.