Don't know if easier or harder applies--it always takes effort to make a relationship work. Anyhow, my first marriage was right after college, which for me was much too young. Didn't really have a sense of who I was or what I wanted out of life, and when my ex decided it was time for me to stay home and raise children--well, I discovered that that was not for me (fortunately, we did not have kids before I figured that out).
Tried again 6 years later, and the second one knew that I didn't want children and agreed to that. Everything went along fine until he got fired from his job for sexual harrassment. I believed his story that it was a setup, but from there on he started just getting stranger and stranger. He finally decided that he MUST have a child and we decided to adopt a baby, with the understanding he'd stay home and raise her (girl only, he said), as my job was more demanding and full-time and his wasn't. Long story short, he bullied me into adopting a 12-year-old girl, I discovered that he did have problems keeping his hands off other women (not affairs, but strange touchy feely kind of stuff that was very creepy); he never touched me but transferred all the nonsexual stuff about our marriage to the 12-yr-old and ignored me in all ways, yet expected me to stay home and raise the girl full-time...I left.
That divorced nearly killed me(developed depression and an eating disorder), actually, as I went into the marriage with a really strong commitment. I met my current BF about a year the divorce, and we have been living together for 4 years now, and he is wonderful and sensitive and kind. We sometimes talk marriage--but it really scares me at this point and I don't know if I could or want to do it again.