It really depends on the amount of prep you want to do and the overall result you are looking to achieve.
Wrap, in my experience, has a bit of a learning curve to be able to get it stretched correctly and laid down without wrinkles or awkward tension. That being said, the small bits you're trying to cover up might not be that much of a hassle. The benefit of vinyl is that you are guaranteed to get a consistent finish that you order (gloss, matte, metallic). I would try one of these
small rolls from VViViD on Amazon.
Dip on the other hand is super easy to use, similar to spraying paint, but will require more prep (wash, pre-dip, masking, draping) and may not give the finish you want. Regular black Plasti Dip has a matte finish from the can. If you want a glossy finish, you have to use a top coat Glossifier. The downside to this is that the finish all depends on your technique, the amount of product used, and even things like the weather (temp/humidity). Over spray is also an issue, stuff gets everywhere.
Personally, for those small bits of trim, I would give vinyl a shot. I have seen guys have success using vinyl to cover up the chrome bits so it's not impossible. Prepping the car for Plasti Dip on such small areas would be a huge PITA and possible not worth the time/effort. If you go the vinyl route, make sure to have a heat gun and squeegee handy.