Unitarian Christian. Not many of them, but having seen the others in action, and having been raised UMC, I would choose Unitarian Christians for the following reasons:
1. Unitarianism. I just can't see the Trinity as something comprehensible, much less found in the Christian literature from the early period.
2. Liberalism. In the best sense of the word, they have an open approach to scholarship, science, etc.
3. Pluralism. Related to 2, but evidenced by their interaction with other traditions (Judaism and Islam most often).
4. They take the teachings of Jesus seriously. This alone doesn't distinguish them (i.e., Mennonites), but they have a much better grasp of those teachings than many of their peers.
5. Ritual balance. I never had to endure an hour long sermon, and we had communion but it was restricted to holidays (including Pentecost, Advent, etc.). In fact I actually learned about the liturgical calendar within the Unitarian context; in the Methodist church it was more or less a blind ritual, I don't recall ever being taught about it (maybe in passing in confirmation).
6. Community. Honestly, the fact that it was small made it easier to get to know people and explore scripture and theology.
7. Intellectual Diversity. While it might seem strange, the Unitarian church I attended was politically diverse (we had a number of Republicans and NRA members). I can't give it points for being ethnically or racially diverse, though; pretty damn white. But then so was the area.