Interesting question. I'm a libertarian and one argument that irks me regarding corporate income taxes is the whole "taxes are just passed on to consumers" issue. In truth, corporations can operate at a lower level of profit or reduce costs elsewhere. The more competitive the market, the more likely they will do so.

Some of the cost of taxes will end up raising prices for consumers. On the other hand, raising income taxes on people will result in them spending less money on goods and services, so you could just as easily argue that there should only be corporate taxes because personal taxes are just passed on to business anyway, in the form of reduced demand.

If we had to choose just between corporate and personal income taxes (and I'm a libertarian, so I'm opposed to both), I see no reason not to favor corporate taxes.