the rankings depend on what ship you are on and what you prefer most between alliance points and rare drops. As for how you can see the rankings yourself, go to any visiphone and click Rankings. From there you can see what alliances are in what positions for the current month and the previous months. As for what makes an alliance good? honestly i'd say it depends on what you want cause for some people the total ap that they have to use the tree buffs might be the most important or the total number of active members might be the most important thing, etc.
Converse with fellow players