Hello dudes,
First off, Skeletons speak for themselves, and are permanent. Plus, If you already have 20 points into Skeleton Mastery, (which most Necromancer builds require) then you have already fully synergized your Revives anyhow.
Second, although it is purely a matter of personal play style, I find Revives to be one of the most entertaining aspects in the Necromancer's arsenal. There are so many cool monsters to use, in reality (or Sanctuary for that matter) the skill is only limited by your ability to plan ahead. One thing I enjoy when running Andariel, is killing a few groups of Blood Lords (I think that is what they are called) which have Fireball and Meteor type spells. Once I have enough Blood Lord corpses around simply Revive them all at once. It is like another entire legion of all fire skeleton mages (that drop Meteors) on top of whatever other summons you have around. Urdars are another fun option because of Crushing Blow. See a wad of Skeleton Archers? Kill them, Revive them and use Amplify Damage or Decrepify to greatly increase their effectiveness. Have a tough boss that has a buttload of minions protecting him? Kill them and turn them against their former master (Andariel for example). My personal favorite tactic is simply to Revive everything you see in order to keep the maximum number of Revives around at all times and just mob the @$*&%$ out of everything. If a few Revives fall behind or disappear, who gives a turd just Revive some more and be on your way. You will generally be leaving/ignoring Super Mana Potions all over the place anyhow, just use them instead of leaving them there to counteract your increased mana usage. I just keep one row of me belt filled with Super Mana Potions and the rest Full Rejuvination Potions. It also bears mentioning that I do not use Corpse Explosion, and as such have a lot of corpses available to use.
Finally, as for which are better, unless you are going with a Zookeeper type build (doubtful), then you should really be using both anyways. All you need to decide is if they are going to be a 1 point wonder, or if you are going to focus some of your build around them and invest more points accordingly. . .