Nowadays the choice of rib cartilage is increasing among patients and the usage percentage is up to 30~40%. Perhaps it's because patient are afraid of rejection of alien material.
The patient in the left picture chose to have revision since he disliked the obviousness and warping of silicone implant. Even no side effect appears for 5 or 10 years silicone implant still can have the problem of obviousness. It's one of the main complaints from patient who had silicone surgery. In addition to the obviousness if silicone ages longer than 20 years it can be calcified and deformed (Refer to 202 article of More Information). 

The patient in the picture also experienced thinness and redness on the nasal tip and decided to have revision using rib cartilage because he was afraid of extrication of the implant.

As you can see from the right picture shaping of rib cartilages simple (right-silicone left-rib cartilage).
In the case of good surgeon rib cartilage can be better than silicone in shape. For example you can compare ready made suits and custom made suits. Silicone implants are just like ready made suits and carved rib cartilage is like custom made suits. Even though custom made suits take longer time we all know which one is of higher quality and better fit.

If you choose rib cartilage for your implant the surgery becomes on a larger scale however if you consider the lifetime wellness rib cartilage worths good reflection.