Thunderbird feature comparison?

Are there plans to make a feature comparison? Many of us are on the fence about buying and not sure if Postbox is that much better than Thunderbird or if it just looks pretty. With Postbox and Thunderbird using much of the same code, I would think distinguishing Postbox would be a primary goal for anyone interested in sales.

Many of the features shown on the Postbox website are part of Thunderbird 3, yet there are some things hidden in Postbox that one may not even know about, such as Twitter integration.