Please allow me to give a different perspective on this. I view building the creations of others, whether from TLG or a MOC, as an opportunity to share design techniques and ideas, and one which will in turn help to grow the popularity of Lego. I don't yet have the skill to create a MOC in a time frame that wouldn't either exhaust or frustrate, but thanks to those that create and share instructions (TLG & MOC's) I'm able to not only able to see the techniques required to create a model, but can express my own creativity by modifying these builds to suit my preferences. At this point, it takes me the same time to do this as it probably would for a proficient builder to complete an entire MOC to the same standard, but that's OK, because there's a lot to learn, and for me this is still an enjoyable challenge that I otherwise wouldn't get to experience.
In my view, some of the greatest creations we see are born from a collaboration of thoughts and idea's. It affords those who aren't necessarily one of the few top tier, all-round builders to be able to contribute in their area of strength. We see this when TLG release a flagship model, and the community here collectively dissects and improves it. 42056 serves as just one example of a set that, in it's official guise, was considered by many to be underwhelming, but the result of the community working on the same basic foundation created something quite impressive, and this was accessible to everyone. Though understandable, it's a shame we don't see this same collaboration as often with MOC's, and TLG working to improve them (Lego Ideas) is even rarer.
Both TLG designs & MOC's are not equal, although both are equally capable of both impressing and disappointing. Both have their place in the world, and both help to make it a little better as a result. Generally, TLG have a more consistent and balanced approach to building, resulting in a more predictable model, whereas MOCS, as a collective, have a lot more freedom to be focused and uncompromising. With MOC's, a specific parameter can be assigned priority above all else, such as looks, functions or RC performance, and the requirements to achieve these parameters can be varied, such as the cost, size, use of illegal pieces or connections. We each have preferences concerning these, and this means that while the official releases may not resonate with them, with the vast amount of MOC's, it should be possible to find one that does so perfectly. Whether you have the time, patience, money and luck to do this, is another matter.
To attempt to discuss which is 'better' out of MOC's & official sets, then we may as well be discussing which is better; tomato sauce or mayonnaise. There's no wrong answer.
...unless of course you picked tomato sauce.