Selective breeding and genetic modification both aim to improve plants and animals, but they have different methods and effects. Selective breeding involves choosing parent organisms with desirable traits to produce offspring with those same traits, which is a natural process but can take many generations. On the other hand, genetic modification (GMO) involves directly changing the DNA of an organism, which can lead to faster results and new traits that wouldn't occur in nature.
Some people might prefer selective breeding because it is a natural method and generally seen as safer, while others might choose genetic modification for its speed and ability to introduce traits more efficiently. Ultimately, the choice between the two methods depends on personal beliefs, desired outcomes, and the specific needs of the crops or animals being developed.