If you're real rich, have a good botd/beast, lots of 3/20s, one boots switch, a shield switch, a demon limb, and maybe some fcr rings, a barb can beat virtually anything given a good connection and a bit of experience. No, gear switches doesnt mean u have to use any absorb, the only thing i carry around for switches is demon limb, stormshield, 2 fcr rings, and a crown of ages.
Necro with lots of block is the only build out there with a passable chance of beating a good barb, if you're going to bring out iron maiden and summons and stuff, barbs can use a variety of equally cheap tactics. given both players playing perfectly the barb would win anyway due to a speed advantage, better damage over time, and the ability to force tanking/ hit without getting hitted
If you're mediumly-rich, bone nec is your best bet, although being a caster you're limited by how fast you can cast and cant do much to vary the rate and angle of your attacks beyond the firing point, as well as having relatively bad health (3k is about as much you can get).
If you're poor/just wana beat necs, eshield sorc is the best bet. I have a sorc that i built using 3 sojs that beats alot of stuff in pubbies... and its not cause im good either... i suck at sorc lol... just hafta get good mana, block... and you're usually good for at least 3 hits from any attack.
o yah, we can always settle disagreements the old fashioned way...