should a shaman every use a staff?
Now, for Pvp.. That's a different story.
Most staves will have just about the same stat totals as most MH/shield or MH/OH combos of equal item level- thus it depends solely on which stats are there (which stats are more valuable to you.) If the particular stats on one combo are better then you probably want to use that set-up but if a shield has equal stats then the shield is the clear choice. Furthermore, if you raid consistently then you will likely have the opportunity to pick up an ideal weapon and shield eventually.
Since the only casters that use caster shields all use spirit you can expect to see spirit on every caster shield from here on out and thus no caster shield will be a bad choice for a shaman. There might be a slightly better choice due to the other 2ndary stat, but the idea is that you can't go wrong with a shield.
If you are dealing with upgrading... well upgrades is upgrades.
If you have a superior staff, though, use a staff.
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