99 ARC with fire saw spear + bolt saw cleaver is my favorite build
I imagine Saw Cleaver with bolt is better than Tonitrus right?
I honestly haven't ever played with ARC
From a min/max perspective I'm not sure. I just never cared for the Tonitrus, mostly because of its low durability.
The interesting thing about a pure arcane build is that you often don't even need to use your weapon because the hunter tools deal so much damage. For a ton of bosses you can just create five blood bullets, heal back up, use the executioner's glove twice, and repeat until the boss is dead.
Bloodtinge goes brrrrrrrr