Help me choose between these two domain names?

I am in the early stages of starting a new project and choosing a domain name. I aim to build this in the open so I thought I'd start with asking for your opinion on a domain name - I've narrowed it down to either: twitkit.com or twitmate.com The product is going to be a Twitter management service where I fully manage Twitter accounts for customers including creating Tweets, choosing images and hashtags, scheduling daily tweets, managing followers/follows and growing an audience sustainably. The tweets, hashtags, images will be hand-crafted but the scheduling etc will be automated through the official Twitter API. Over the last few months I've tried this out in-house for a few client's that I provide SEO/social media services for and it's been a hit. So I'm taking the step of developing it into it's own product. My personal feeling is that twitKit sounds better but twitMate describes the product better. There is also a small branding issue with twitKit in that there's an old, no longer used, Firefox extension with the same name. It's not a showstopper since there is no Trademark or website but they do still have a Twitter handle and github page etc. With this in mind which do you think is best?