What's a factory saddle? I keed. I keed. Actually I haven't bought a factory assembled bike in over 30 years. I ride only one saddle brand/model now and it goes on every bike I put together. No exceptions. There is only one kind of saddle upgrade, and that is to be more comfortable. Nothing else matters. If your new bike saddle is the most comfortable you know of, then keep riding it. If you know of a more comfortable saddle that you like better, make the change. Easy-peasey.