Seriously, this is an ascetic issue. Well at least tour argument makes sense now.
Scale wise, the Bellator is a much better fit for Armada as a game. However, if FFG chooses to do an Epic scale, they almost need to start with the SSD Executor, because there will be a huge fan demand. The Bellator is by far the next best option from a marketing perspective. That ship is everywhere on the internet these days, so it enjoys a very high recognition with fans.
Personally I fall firmly into the "Why not have both?" camp. I want epic scale expansions for Armada, and I see the SSD as the obvious choice to start it off, from a marketing perspective. While scale wise it is not ideal, the creation of a SSD model for Armada establishes approximately scale for everything else to be included.
I may need to knock up a prototype three tiered base, just to see how it could work, range wise.