Royal Road readers are much higher quality fans, but there is a negative with the platform. Web Novel is the perfect platform for those who want to earn money without needing to worry about the quality of their work. Literally to an extent where you could have horrific grammar but as long as you write enough chapters every week, the readers might even look past it and continue paying you.
With Royal Road, quality is LITERALLY everything to the point where those who want to see you succeed, will point out every little error so you could fix it and improve on it and as an author. So before you decide Web Novel or Royal Road, you have to really ask yourself if a grammar nazi will give you a pass on your writing to a severe degree, otherwise the chances of you even building an audience on Royal Road is incredibly slim.
I can understand if you want to go to Royal Road because yes the Patreon system can technically make you more money, BUT are you really going to trust yourself so much not to possibly just post on both as a normal author and grow as an author and understand what to expect before deciding?
These are all questions you need to think about before even thinking about getting paid for your work. :) -The Sleeping Tadpole