I find Alprazolam sublingually has a very chemically taste and not one I ever fully got used to like Oxycodone. Also, with short-acting medications like Xanax or Valium I never found it a logical ROA. Since Clonazepam can last half a day for some people, even if you are altering the lifespan (which I personally have never experienced) it will still last a really long time. Plus that minty taste is actually quite enjoyable.
TLDR;
I find that Clonazepam, when taken sublingually, has an onset with speed appropriate for a panic attack (comparable to Alprazolam), whilst still maintaining a long enough lifespan to combat general anxiety and PTSD throughout your day.