Both techniques are reproductive technologies, and as such, we cannot say that one is better than the other. Actually, it depends on the diagnosis of each couple.
In the case of conventional IVF, we put the oocyte in contact with a determined concentration of sperm, so that the sperm itself fertilizes the egg, which resembles natural fertilization to a large extent.
In many cases, sperm quality is altered, in which case using the sperm won't be possible. In such situations, we use ICSI. It consists in microinjecting the sperm, which is subjectively selected by the embryologists, into the oocyte.
Read the full article on: Intracytoplasmic sperm injection: What is ICSI and how much is it? ( 22).
Aitziber Domingo Bilbao
B.Sc., M.Sc.
Bachelor's Degree in Biology from the University of the Basque Country. Master's Degree in Human Assisted Reproduction from the Complutense University of Madrid, and Master's Degree in Biomedical Research from the University of the Basque Country. Wide experience as an Embryologist specialized in Assisted Procreation.