Don't get a coaster for park/trails. Thats the dumbest thing I've ever heard. You don't get the engagement you need. There's few park tricks that a coaster makes any sense and absolutely NOTHING at trails unless you plan on 180ing doubles or riding trails backwards.
Why do you want one? Because they don't make noise? You can silence a cassette hub and get the no-noise with the engagement that you actually need.
If you're dead set on a FC go with the Ezra, so you can swap to Cassette when you begin to regret it. Or find a used FC for $70- and ride it for atleast a year before you make the decision to buy a brand new FC.
Refs : SnM An1mal, GThompson121, Chuck8273, blizzbikes, bmxsteve99, kevin.brock.338, zinum, Brian_Griffin, billyhandyjunior, riverM, tomdon
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