Nearly every time I add the free EGS games to my cart the checkout fails. I frequently have to restart the EGS client for checkout to work (and even then it fails often).

I launched EGS just now to time some comparisons and it's a black rectangle on my screen with no GUI (probably self-updating). I had to kill the process and restart it.

The Look and Feel for the EGS client just feels slow. Not that Steam is always amazing in this regard either but it's way better than EGS. Go to your EGS library and click between "favorites" and "all games". Switching from favorites to all games takes me ~4 seconds, every time (if you have any meaningful number of games).

The search/sort is slow. Steam's feels instant.

The library list has a ton of wasted space. In terms of vertical space, the Steam library lists three games for every game EGS lists.

The EGS social features compared to Steam are downright anemic (and Steam is pretty bad compared to something like Discord). You can't even set an avatar in EGS. Even EA's Store app (whatever they call Origin now) lets you do that.

I'll stop there. I could rant for much longer.