For a camera that you carry everywhere with you, being weather proofed is a big advantage. You will have one less thing to worry about. 24.0X Optical Zoom
24.0X Optical Zoom of Panasonic FZ300 will give you a lot of flexibility considering this will be your only camera during the day. RAW shooting capability
RAW files contains much more color information compared to JPEGs, and gives you more room for post processing without significant quality loss. They provide wider dynamic range and option to recover shadow and highlight clipping to some degree.
Medium size Body
With relatively smaller body compared to DSLRs and better ergonomics compared to Compacts,Panasonic FZ300is a good compromise between size and functionality.
Carrying this weight all day may not be very comfortable for you. Body Thickness 117mm
With a thickness of 117mm,Panasonic FZ300 is not a pocketable camera for sure. Small 1/2.3 sensor
Panasonic FZ300's small sensor struggles in low light situations compared to larger sensor.