Scanner Canon 646UEX or Umax Astraslim 600

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Hi, I want to buy a scanner but don't know which one to buy. I'm searching for cheap scanner and this scanner price around $60. I like the nice physic look from canon but my friend say canon scanner isn't good as umax. But maybe he had was the old model canon. Does anyone have experience with this two scanner? And did 600dpi is good enough for scannner? thx for answering.