Don't consider this a complete answer, as there are various subtleties and features that are unique to each product that may be useful depending on your exact requirements.
However, at a high level:
Though Crucible has more comprehensive support, I believe pull requests are a more streamlined way to develop software. I actually did a presentation on the topic here:
(ignore the SaaS part of the title, 95% of the video applies to all software teams)
So if you're in a position to use a Git-based branching workflow, I'd recommend Stash. If you're stuck on another version control system, I'd use Crucible. We have no plans to discontinue either product anytime soon.
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