Celtic Heroes

Well, you need 256 tokens.. dont really know what you would gain from an equation.. never the less; Tier 1 silver mount: 4 tokens Tier 2 silver mount: 8 tokens (T1x2) Tier 3 silver mount: 16 (T2x2) Tier 4 silver mount: 32 (T3x2) Tier 5 silver mount: 64 (T4x2) Tier 6 silver mount: 128 (T5x2) Spirit: ...

Been about two years since i last played. Was thinking of getting back in to it.
What worlds are the best to start in nowadays? Most recently played in ros and arawn but what do you guys suggest?