At a local level, possibly what seems to be the most reasonable candidate likely is the best choice. But, (IMO) on a broader perspective, in a represenatative government (as it seems to exist today) your political choice is there to represent the party under whose banner they stand, not to represent you and you and your communities perspective. So, what they say does not correspond with what they will do.
It is likely wise to use the best of your intelligence, and your gut, to determine which of those courting your vote is the best choice. But, it's best to prepare yourself for a dissapointment, at least at some point.

That likely fits with the title. One reason is different circumstances creates different perspectives.

OK, now back to the reasons why people disagree.