Both cars have very similar extra's. Neither has PDC or auto lights and wipers.
They both have NAV with pro radio's, I think they both have logic 7 stereo's. Xenon's obviously with headlamp washer systems, m-sport, Bluetooth with phone pairing etc.
Then the 135i has the sunroof where the 335i doesn't.
That's basically the only difference, and manual vs auto.
I don't mind the auto seen as I change gears all day everyday in my corsa Bakkie, this is purely a weekend/gym car.
The manual is more involving and I can throttle blip which makes me smile! Ha! Ha! True story.
But the basic specs are just about the same on the cars hey.