HMO vs PPO

Hey guys. I'm pretty new to this app and wanted to get some advice or views on HMO vs PPO when having a baby. I initially had HMO insurance but had to change to PPO due to being overseas. Now that I'm back in the US, my spouse and I are trying to have a baby and figure out which is best to have during and after the pregnancy. Pros? Cons? Your own experience? Thanks all in advance.