Re: Should I post on both Royal Road and FictionPress?

After seeing that one of the top stories on here, mother of learning, was originally on FictionPress, I quickly made an account and uploaded the prologue of my fiction. Though the annoying thing is the character limit on the synopsis so I could not state it was first posted here. So, I was wondering if that was a good idea; more so I'm wondering what the pros and cons are of uploading on both sites.