It's pretty much down to these 2.
Edit: Alright, I got enough info. Time for fun. Don't worry, I don't plan on doing this very often.
[i]Well?[/i]
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I did see an interesting reddit article about the potential dps for sunsingers with fusions and viking funeral combo. Apparently mathematically it can out dps the spindle for the duration of radiance but it just seems unlikely until we see more people do it.