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I agree with qwerty on this, Planetside get's a bit monotonous after a while, whereas in Eve there is so much depth with different skillls and ships, different ways to make money etc. I think Eve will keep you busy for a very long time.The only drawback in your case is that Planetside is constant action, but Eve is more contemplation and a lot of brainwork. There is some action but not as intense as Planetside. Give the free trial a go, you have nothing to lose that way. It's only 14 days so you will barely scratch the surface but you will get some idea.
Protect me from what I want.
Yeah Eve has more replayability.
Planetside you can play for 8 hours straight and its fun, but if you play for a month it gets boring.
Eve has alot more to do besides just mindless kill/die/spawn/kill/die/spawn/die/spawn/kill/kill/die/spawn that PLanetside has. Especially when your BR20.
EvE or Planetside...?
Whiskey or milk?
Black Metal or Folk lore?
Quite a difference between the two of them, but:
Planetside: action all the way, from start to finish; group tactics, weapons, explotions, action, grenades, action, strategy on squad and, sometimes, on "army" level, death and action.
EVE: is mostly about develop: develop your character, ship fitting; develop your strategy, tactics, products, logistics, resource and corporation management; develop your diplomacy, politics, and not by any means the least (but totally dependent on your own free will) your combat capabilities.
You will have to develop: develop into someone; because, in the begining, you will be a nobody, a face among hundred in the rocky-channel, a face in the crowd.
.............When in doubt, troll.