I am thinking about changing the name of my site. The new name is available with .re domain (that spells the name) or a .com. I have registered the .re and the .com is parked and for sale so my question has 2 parts.

Is it worth buying the .com or do I really not need it? How much does it matter in terms of losing traffic and other factors?

If I do buy it which should I use as the primary domain?

Thanks!