If you mainly want to use it for award searches, I reckon kvs, used it for many years now, love that its an actual program on your PC and not a web based interface.
If you want something that you can also pull availability and fare data, don't use it thou since KVS is scraping websites and not paying for that service and fare information and availability information can be removed at any time (happened before recently).
This won't happen with expert flyer since the pay $ to their data provider.