Yeah, The Inquisitor is better than the Channeler. They both do the same damage, however, Channeler gives you Guild Seals faster, has Lightning Damage, and adds +15 when full upgraded
Inquisitor has +15, but also has Restore Health per hit, and Gives gold per hit.
The Champion right now for me, isn't even maxed, only a 4 star and it sits at 101 damage. Both swords are sitting at 41