Well, having a hotline to Heaven, even with a rogue sidereal, would be handy and kind of cool.  Personally, I've never been fond of Abyssals because how their stuff is handled is kind of meh.  They have good potential, but their mechanics get in the way.  Sidereals also have some mechanical quirks, but Fate Audit Ninjas is kind of awesome and overrides most of my objections.<br/><br/>However, none of this matters because what kind of ideas you had for each is more important.  What kind of sid or abyssal were you interested in playing?