panny zs15 vs nikon s9200/s9300
I had the Nikon S9100 and replaced it with the Panasonic SZ15. IQ was just about the same at all ISOs, but the handling of the Panny was much better; also I did not care for the Auto WB of the Nikon, it's too cool for my liking. One thing I did like about the Nikon was the pop-up flash; it had a real quality feel to it; better in fact than my Nikon P7100.
I don't anything about the S9200/S9300, sorry.
Whatever you choose, happy shooting!