I got myself the Dark Thorn Blade. But however... I'm not a fan of the charge.
It's just a bigger initial swing. I've heard people saying that BTB charge is a more defensive variant of the FF's but you have to stand right in an enemy's face for good damage as you'll backstep before slicing.
So I got a Flourish for 750cr from some random guy and I'm not sure if I should get FF like the last time I had a Flourish or if I should mix it up a bit.
Except that everyone tells me that the Flourish variants suck.
So... should I just stick to Final Flourish?
The problem with the Flourish variants is that they have a large damage reduction compared to the regular flourish, while having an extremely low status-infliction rate. For the 5* Rigadoon, it has a Slight Chance of inflicting Moderate Stun to an enemy on hit, which sounds okay on paper, but in practice, I've found that the chances of inflicting stun are probably around 10% or lower, per swing. This hardly makes up for the damage reduction.
Unless the "Slight" chance is increased to "Fair" at some point in the future, I would stick with an FF or a BTB.