I’m going to split the question into two parts: one is easy to answer and one’s a little harder.
So first, are they better? Are they superhuman? The answer to that is absolutely NO.
No one does IVF to create a superhuman. People who use IVF do it as a last resort after many unsuccessful attempts to have children the natural way. So no one’s taking superhuman sperm and supermodel Ivy League eggs and putting them together to create some superhuman. That just doesn’t happen. The reason we want to procreate is to pass on our own DNA. That’s behind the sex drive and everything that makes us go. And so in IVF, when people want to have their own babies, they want their own zygotes. They want their own DNA. They don’t want some outside superhuman DNA. They want kids who are like them. And even when people look for donors, they look for donors who look like them. That’s the main search criterion for most recipients: to find a donor who looks like them because they want kids who are like them. They don’t want some superhuman. That’s the realm of science fiction when it comes to IVF that people were afraid of: that these super creatures would be created in the lab.
Now the other thing is: are IVF kids not as good? Are they defective in some way? Is there some problem with IVF children? Well, we know in general that IVF can have a risk of premature birth and low birth weight,