+1 for Aettir.
Generally the only time I use swords on RUN is when opening Darkness with Requiescat (very rare), or when fighting Caturae, for which again, I sometimes need Requiescat to break the shield.
I did actually use Flyssa when CPing, it was great for tanking and making skillchains. My gear wasn't great back then so Flyssa helped cap PDT without giving up all my TP stats. My damage output was poo, though. I gained TP fast and took little damage, but my damage was abysmal.
When fighting caturae, I just use Naegling+Reikiko for damage.
Ultimately, outside those niche situations, I think Aettir is just better.