the best rift guides

Which is the best rift guide?

You could try Xerxes guide , it's overall the best leveling and strategy guide and has both Guardian and Defiant factions included. It costs $37.1    
Alternatively you can get Kalmars guide  for $47 but it only has a leveling guide for Guardians, so if you plan to change factions it would be useless.

There's a few other guides as well which you can check on the same website I did, provided in the source.