I have Warpgate. Not sure I need Galaxy on Fire, too. Thoughts?
YES YOU DO!!!
Warpgate is just a parcel delivery service in space. You have nearly no possibility to control the action.
In GOF2 you can do whatever you want. DOGFIGHT, mining, trading, whatever AND you CAN do all that by yourself and experince it first hand. And not being restricted to only some boring micromanagement.
GOF2 is the real adventure.
Galaxy on Fire 2 is a much, much better game. I've logged probably four times as much time on GoF2 as I did on Warpgate, and I've enjoyed it more. GoF2 is a fuller game with more options, vastly better combat, more customization, and a much better (and more immersive) story. I don't regret getting GoF2 at all.