it also depends on your secondary profession...because if your second is an elementalist, ranger, monk, or mesmer...lmao i would go with the energy boost because most of them has spells, enchants, hexes that usually cost 10 energy... with your necro spells and your second profession energy can get a little tight...
if your second is warrior i would go with the extra armor, unless you plan to use your warrior for tactics or strength. if you plan on going close range with your necro, extra armor is quite pleasant.
oohh heres a tip..only if your second profession is a monk though..lol and that you use animate bone horrors or that bone fiends..spells. you should use heal area everytime you're like walking around with your bone friends, so they won't die on you

this is actually a common knowledge..but i saw my friend do this and i was like "whoa!" and you can get a whole army of bone thingys following you! but of course this way costs a lot of energy...
if you need BONES for your armor...i got them! i have over 500 i need to get rid of...i'll sell it to you for 5g each! or we can figure out some costco discount thing...
my ign is mister peachy or just pm at this account