On paper, Form Scythe might not look that amazing if you just do a straight comparison. In practice though it's a beast and at or near the top of the wand list simply due to the beams it shoots when doing any melee attacks. IIRC it took until Lavis Cannon itself before something took it's spot on JP. Riding Quests should also drop it much more often than whatever its current sources do.
You'd have better luck getting the Ceres Ignatos Zara (yellow hunting stones were left in the game after the MH collab, you use them to buy the Ceres Ignatos then use them to upgrade them at
Zieg JigZig), Ares Wand, Eightrei Mirage, Dim Wand, Blood Pyrus or any 14* exchange weapons (there's a couple of es exclusives that will probably be exchangeable like the rest but for a rarer item)
Everything that you listed there comes from either Ep5 or Ep6, this doesn't help answer the question in any way for the game's current state.