Dilemma – Help needed!

I’m going to be working on a couple of proposals for http://www.abaddonbooks.com/ @abbadonbooks. They have an open window from Midnight 31st August through to September.

My dilemma is – do I propose the world of Blaise Maximillian – or use one that has been in the back of my head for a while? The reason I’m asking is that if I get accepted, the universe becomes ‘theirs’ and other authors can also write about it (but Blaise remains mine). Similarly that’s why I wouldn’t use Spring Heeled Jack, as he’s set in my Shattered Lands: Torquemaster Rising andShattered Lands – A Steampunk Universe world.

So, do I keep Blaise to myself, or use the Volcanic Pirate-infested world of Sherrapu, set in the distant future in a blend of steam punk, pirate punk and high jinks?