I have both IEMs and a pair of Headphones. They are a for different use cases. I use the Headphones when I'm working from home and working, the reason I prefer headphones for this reason is that it's more immrersive imo to IEMs and the soundstage/imaging is so much better, and since the inflation of energy bills, they keep my ears warm so helps with not turning the heating on. With IEMs, they are great for portibility and do not leak any sound when listening at loud volumes. So my advice is to own both if you can.