There are a number of things to consider when comparing politicians.

Character

Intelligence

Their basic philosophy

Their past record

Their leadership ability

Their ability to work with others

Etc.

The trouble is, though, that politicians nowadays are fish swimming in badly polluted waters. What I mean is, huge financial forces have corrupted and taken over the political parties, the media, and the governments. Any politician of genuinely incorruptible character is going to find it very hard to act honestly within a thoroughly dishonest system that is all around him or her...and will probably not rise high in the pecking order. Or will be blocked by those around him or her.

If you don't play the game by its corrupt rules, how are you going to work your way up through the ranks of power?

Politics has become a game of salesmanship. The parties market a candidate like any other product is marketed, in order to make a sale to the public. That's why their promises when campaigning are seldom fullfilled once in office. It was just a sales job, not a genuine promise.

"Let the buyer beware."