re: Is this a kissing bug or an assassin bug?

Cool! You can look at the "children" in that genus and try to narrow it down to a specific species. Assassin bugs aren't that hard, and most of them should be described. On there somewhere under genus you will see it broken down into different species and each one will have it's own page.

ETA: The short wings are a hint at its age or life stage. It is in an early instar where the wings haven't fully formed yet. The adults will have the full wings.