It is not that one option is better than another, but a question of preference. In both cases, intended parents are addressing childlessness, and in this sense both options have their pros and cons, although there is some asymmetry between them, including embryo adoption.
While in adoption neither parent has a genetic connection to the child, donor-egg IVF gives the chance for one parent to have a genetic link with the baby-to-be. This, however, may create in the non-genetic parent a feeling of "exclusion", while with adoption both share the same status.
For some, the level of privacy of assisted conception is appealing, and for others adoption is the best option because it is a more established system that gives a child the opportunity to have a home. Be it as it may, our advice is that you consider both the advantages and disadvantages carefully.