Where to Begin?

Working on my current WIP, and this is a weird one for me. Normally, I have a very clear idea of what the beginning and end should be. Now, that doesn't mean that they both turn out that way. But I can see an initial version. With this one, I can see more of the middle and the beginning...is not clear. I've got several scenes, each one would start the book one scene earlier.

They aren't competing ideas in the sense that it would be one or the other, but that very first scene, the one that kicks everything off can start either pretty close to the main "everything changes" event or a little farther back.

The advantage of the farther back approach is the chance to give more context so readers understand why certain events are significant without me having to spell it out. That's a good thing to avoid--the info dump or the telling versus showing.

But starting closer to the "everything changes" scene means you don't have to wait so long for something to happen.

With The Silver Spoon, I start with the diner explosion pretty much right off. It works in that case because an explosion is pretty self-explanatory. But the opening situation I'm working with here--someone waking up from cyrogenic freezing is a little more complicated. Also, it's a future setting slightly, which requires some context.

If I follow the Writer's Journey, I need the ordinary world first, which means I'd have to back up even farther, and I've got part of that scene written too. But does that go too far back? I don't know...

Just need to think more, I think.