Do you have a choice bettween the two?
NOVEC rarely has outages, but I suspect that is because a lot of their transmission lines are underground. That is very area dependent. Are there visible electric poles in the neighborhood?
Dominion seemed to have a lot of little (1-5 min outages) outages in Centreville. NOVEC is also a cooperative, so if they make any money, they end up cutting a check to the customers (
http://www.novec.com/Customer_Services/CashbackFAQ.cfm ) . Dominion never does that, as all the extra profit goes to the shareholders.