My daughter was buried and we had intended to have a headstone, but then I saw a documentary about the terrible conditions of the workers in a lot of the quarries where the stone comes from- I think in India, but it was a long time ago so I'm not sure. A friend carved a large Celtic cross from oak for us, and we had that put up instead. It's beautiful and felt like a fitting tribute to her.
I'm glad that I have a place to go and lay flowers and pray. I'm glad that her place of rest is marked and that she is buried among members of her extended family.
When my nephew died, his mother had him buried, but there is no grave marker.I find it sad and it feels cold to me not to mark a grave, but I've never seen anyone at his grave, so perhaps she doesn't feel the same (his father never met him which is why I only mention his mother).
I don't think there is a right way. My choices probably seem unusual to some people, so I am not going to judge anyone else harshly for theirs. I visit my daughter's grave (and her grandparents', great uncle's, cousin etc) reasonably often, but I find it terribly upsetting even after 17 years, so I try to go alone. I understand why other people might not want to visit graves, but it helps me to do so, because it is the only thing left that I can do for her.