In a christian point of view I think the trinitarian doctrine is far superior because:
1) the trinitarian view encompass the unitarian, because it have perfectly the Father-Son relationship. The roles this two persons of Trinity it's not related to their substances. Two adult humans non related to each other can build a relationship as father and son, but it's not implied that the father role is a superior human or adult.
2) Jesus was not exactly the Son God when on earth, because he was a lowered (under the angel status) version of Son God (no man can see God). So is consistent to him speak about the Father God as being superior. In a role relationship a son always take the father as superior, like a pupil and a teacher.
3) There's a unvenial sin regarding the Holy Spirit. Even in doubt, what is more risky? Consider the Holy Spirit as a person or just like an irrational force?
The trinity concept makes the bible less inconsistent. Because it explains all the passages refering a clearly hierarchical relationship between a father and a son and all passages clearly trinitarian, like the Holy Spirit having feelings. Trinitarians have no problems with texts about father-son relationship, but unitarians have a lot of trouble with trinitarian texts.
I do agree with the more consistent view of Trinity, and I'm not a christian anymore.