I really think wands are superior honestly. Even without the upgrades. Why?
Well.. what is the most energy you can gain from a staff? as far as I've seen it's the same as a focus item unless you upgrade, which can be expensive to find those high bonus energy staff heads. Good luck, heh.
Secondly, wands also give energy bonus/faster cast/faster recharge.. and I really think that although you lose with the -1 energy regeneration.. it is definitely worth it to have like 95 energy. That is sick.
So definitely think that wands/focus items are better. ALSO -- PLEASE DON'T CUSTOMIZE GODLY WANDS..
Oh my god. Someone tried to sell me an insane wand that I would've paid 20k for but it was customized and I could've cried (been looking forever now) .. so please please.. don't customize good wands. the 20% is not worth it.