Better in what way? Probably different metrics or ways to look at experiences to make direct comparisons.
I probably have a few dozen really important moments that stand out in life. Family moments, food, personal/professional triumphs, a sunrise or sunset, travel experience, great wine, or even just mundane moments that made me feel good. The great sex of my life will is in there. (I imagine the birth of your child would be but I'm not a dad.)
Sex is one of the few experiences where you can look at life, death, the face of "God," the universe, directly in the eye. It's fleeting but can be transformative. Doesn't have to be - sometimes you'll just nut. But with the right partner(s) (or alone) it can be memorable. The hard part is both staying present and letting go of everything all at once. I guess that's why they call it agony + ecstasy.