Full-frame delivers better image quality, from a sensor area more than double the size of APS-C. Better sharpness, greater dynamic range, lower noise. Whether it'll be significant or not, for the work you do, is a different question. Also shallower DoF at same f/number when the subject is framed the same, from the same position - roughly one stop less. Lenses are bigger, heavier, and usually more expensive.
7D Mk2 is a faster camera though, at least on frame rate, and has more effective 'reach' with longer lenses because it puts more pixels over the subject than a 5D4 when cropped down to the same framing, hence favoured for wildlife and sport. It's also a lot cheaper