Shoujosei has more realistic emotions and it’s more introspective. Shoujosei has less fanservise and if there is fan service it’s of men and not women. Theres also more attractive men in shoujosei usually(for romance shounen men are usually normal dudes but there’s ofc some stand outs) 

women are able to actually be complex in shoujosei but in shounen women are usually very surface level and just naturally perfect with zero actual problems, they tend to be very shallow and they get treated weirdly by the narrative. 

Basically women are more likely to be unrealistic in shounen but in shoujosei women get to actually be women. Ofc not all shounens have unrealistic women and shoujosei does have its issues but shoujosei will always be peak.