Paula,
You'll have two camps here with this answer.
1. OSPF - Standards based, not as many IOS defects, much harder to administer and troubleshoot.
2. EIGRP - CIsco specific (non standard), Easy to implement / manage (caveat this by saying it does not scale as nicely as a well designed OSPF network)
So, if you have or plan to have any non-cisco devices OSPF is your match. If you have a feeling this might be operationaly hard to adminster then EIGRP might be right for you if you are a Cisco shop.
Hope this helps you,
Don