all 3 serve a purpose, but not all will fit your subject matter 100%

sigma.... large, need tripod at long end f6.3(1/3 over f5.6) at 500mm

300f4...... fixed, semi fast and the lightest of your choices, sharp

100-400...zoom, pretty sharp! f5.6.... high iso in low light

btw... all 3 lenses rock for the price and produce razor sharp images in optimal conditions

wildlife..... reach is good

sports, fast / handholding would be best bet