Generally, Omni-Man is stronger. He has superior physical abilities and a longer history of using his powers effectively. However, Invincible has shown potential to catch up over time.
Sure. Invincible's journey in the comics sees him continuously evolving and getting stronger. Eventually, he outpaces Omni-Man, but it's not an easy or straightforward path. There are many challenges and setbacks along the way.
I'm not sure if there are specifically 'famous' Omni William Penn ghost stories. It could be that there are some local tales that are well - known in the immediate area, but not on a wider scale.
I'm not very familiar with specific 'Omni William Penn ghost stories'. But generally, ghost stories often involve haunted places. Maybe in the context of William Penn, there could be stories about his old residences or the areas he was associated with being haunted by spirits of the past.