Oh nice, I hadn't heard of Whoogle. Giggle requires a Google account to log into the Programmable Search Engine service and get a list of the account's Custom Search Engines. This is necessary because Google doesn't currently offer an API to do it.

As far as speed, I can't really say because I haven't used Whoogle before. From what I've seen so far, result responses are pretty snappy. I will say the results could be considered more accurate since you can filter in/out the sites you actually care about and curate site lists any way you want. They both use Google search so I'm sure the quality of the results is the same.

Will give it a try :) looks interesting. Thanks for the share!