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Nothing wrong with "just a tune" on the N54/N55. The engine has a ton left on the table from the factory without having to change parts. You'll get 50% or better of the power gains of "tune + turboback + FMIC" by just getting a tune, and for about 1/5 to 1/4 the cost.
There are already tons and tons of threads about the JB4 vs. Cobb. Posting yet another thread may not be the best way to collect more information. I would suggest spending a few hours reading with the help of the forum search. It's not all going to get reposted here in this thread.
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2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS
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