Can anyone speak to the subjective experience of the difference between S3 and S6?

I love Hiyuki, and I currently have her s3. I am SUPER tempted to get S6, but also tempted to try for as many Hsin cons as I can. Would love to hear from those who’ve experienced S3 and S6 playstyles and how different they feel subjectively; does it feel satisfying/worth it? Any thoughts would be awesome :)

PS I have Lucille and Suisui, in case that makes meaningful difference!