Yaoi manga in Mangago often features intense romantic and emotional relationships between male characters. The art style can vary, but it usually focuses on depicting the depth of these connections.
I don't know for sure. Sometimes manga availability can change. You could try doing a search on Mangago or checking related manga forums for the latest info.
Well, Masca manhwa could focus on certain themes or genres that Mangago doesn't. Also, the character development and plot progression could vary significantly between the two.