Nexplannon or depo after baby?

I have two kids. I was on a pill before kids and loved it. Tried the patch (allergic) and a hormonal iud after my first. I hated the IUD. I really liked the pill I was on but I want to get pregnant in 3-4 years and NOT before then lol. I don’t trust myself with the responsibility of the pill. So I’m going between the nexplannon and depo shot. What are your experiences with these? Side effects? Difficulty getting pregnant in the months after? Thanks!