I believe having 2 arp procing trinkets would be useless since the likelness of them overlapping is pretty good. Wich means one of thier procs would be going to waste. and seeing as your already over soft cap with needle encrusted scorpion by a good bit i would just go needle encrusted scorpion and the mark of supremecy. But hold on to mirror of truth in case you start getting alot of hit gear so you have a dps stat trinket to switch in.
i've been trying to get this new trinket and test it with grim toll, since the NES procs with crits, maybe it won't proc at the same time as grim toll, so if you are just soft capping your Arp maybe the uptime of the Arp buff could be higher, but idk until it drops for me