Being somewhat of a min-maxer I don't even think of classes in terms of the two job abilities on them anymore, but as the sum total of their unique equipment and all the support and counter abilities they have. (...ok, that sounded a just a little pretentious.)

I have always been partial to the dragoon with punch/martial arts. Gives the Dragoon a little more utility and gives me peace of mind with them having revive, as they are usually the last to die.

As for the White Mage/Summoner the summoner will have higher MA but the White Mage has higher speed. I usually consider the White Mage as a better option.