PAX may be the lastest, but I think the jury is still out on the greatest. Lucky for you, the Solo is right up there with the rest of the best portable vapes.
I love the look of their hybrid with it's short fat can and long thin neck. Really excited for you and to see Ray's diamond grid work - I've never seen it up close!
I'd just get the Solo. Wait for the Ascent and see how it's received. You can always sell your Solo later if you still want the Ascent and you'd probably make most of the money back.
I'm trying to decide if its worth it to wait until their next sale (420) or just buy the piece I want and eliminate the risk that it won't be available in April.