I am personally going to try an origin character first (probably Shadowheart). If I don't like how Larian handles origin characters as the MC, I will switch to a custom Tav. At least to me, if you value additional reactivity, then one of the pre-built origin characters is likely the best option.
I will admit that I found Shadowheart's Trickery Domain somewhat underwhelming during early access, but it sounds like we will be able to re-spec class and ability scores, so I am not too worried about her starting off with the Trickery Domain.
