Panasonic FZ1000:
Macro shooting is possible with a minimum focusing distance of just 1.2" at the wide end of the zoom range, or 3.3' at the telephoto end.
"Leica DC Vario-Elmarit 16x Zoom Lens Benefitting the image capabilities of the FZ1000, an expansive 16x optical zoom Leica DC Vario-Elmarit lens is built-in, and provides a 35mm-equivalent focal length range of 25-400mm with a maximum f/2.8-4 maximum aperture."
Source: http/www.bhphotovideo.com/c/product/1057135-REG/panasonic_dmc_fz1000k_lumix_dmc_fz1000_digital_camera.html
As for the zoom and macro capabilities of the Canon 600D it will depend on the lens you use as each lens will be different.
Panasonic FZ1000:
Macro shooting is possible with a minimum focusing distance of just 1.2" at the wide end of the zoom range, or 3.3' at the telephoto end.
"Leica DC Vario-Elmarit 16x Zoom Lens Benefitting the image capabilities of the FZ1000, an expansive 16x optical zoom Leica DC Vario-Elmarit lens is built-in, and provides a 35mm-equivalent focal length range of 25-400mm with a maximum f/2.8-4 maximum aperture."
Source: http/www.bhphotovideo.com/c/product/1057135-REG/panasonic_dmc_fz1000k_lumix_dmc_fz1000_digital_camera.html
As for the zoom and macro capabilities of the Canon 600D it will depend on the lens you use as each lens will be different.
Rolli makes an excellent point. The advantage of the Canon is that you can change lenses (macro, prime, zoom, etc.). All depends on how important these things are to you.