It seems to me that dwarves would be most likely to serve Sauron or Morgoth for the promises of wealth. The dwarves that fought for Sauron in the WotLA for example might have been promised gold, mines, Mithril, etc...
And the dwarves hardy and resilient nature makes them impossible or near impossible to break into submission-so Sauron and Morgoth would likely have failed at attempting that-instead they would have promised them things the dwarves' hearts longer after.
Or used the fact that some dwarves were suspicious if not hostile to the elves to direct them to their side.
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