Experienced full stack here. Neither are easier, but front-end is more annoying to me. It's the only part of the software that non-coders can understand - thus

Experienced full stack here. Neither are easier, but front-end is more annoying to me. It's the only part of the software that non-coders can understand - thus there are endless battles on certain designs and why they won't work, etc. These days, a lot of front-end is also "back-end". If you are managing state client side in a SPA, you have a back-end - it's in the browser. I'd be wary of anyone that can definitively tell you one is harder than the other. They don't know what they're talking about.