I guess it depends on the shape and size of your hands. For me the Steam controller sucked, the xbox controller fits much better in my hands but also isn't quite right sometimes.

I've heard a lot of other anecdotes from people who found the og controller really comfortable when others weren't, so you're definitely not alone there. Personally, I was constantly readjusting my grip but could never find that illusive sweet spot, so after awhile I'd start straining and cramping. I had a couple bumping around for a few years that I pulled out occasionally but I eventually sold them on eBay when their prices skyrocketed and mine were just collecting dust.