So both Vortex and Flower Storm reduce the enemy atk, Flower Storm does 55 wind atk dmg, while Vortex deals DoT through lacerations. Ripfleshia doesn't have Vortex, so Flower Storm fits it's tanking role better.Ripfleshia just strikes me as weaker Grandly, same ability and moves with less bulk and can't inflict statuses as often (They both have needle rose but Grandly has Vortex to inflict cut for sure). I ran grandly with exacly this set except replace flower storm with vortex.
Let's do the stat comparison:
Ripfleshia: 285 hp, 172 atk, 205 def, 172 agi
Grandly: 237 hp, 205 atk, 238 def, 124 agi
Ripfleshia has more hp and a lot more agility, but less atk and def.
And Grandly has acces to Vortex, not sure if it's better than Flower Storm, but Grandly has a choice between either.