You asked
Canon 18 150mm f 3 5 6 3 vs sigma 16 300mm f 3 5 6 7 dc os contemporary?
I don't have a catalogue page for the Canon 18-150mm f/3.5-6.3, so I can't give you a fair head-to-head. I can tell you about the Sigma 16-300mm f/3.5-6.7 DC OS Contemporary. It's an 18.8x all-in-one travel zoom for APS-C, and it's stabilised and autofocus. On an APS-C body such as Sony E, Fujifilm X, L-Mount or Nikon Z, it frames like 24-450mm on full frame. Its aperture narrows from f/3.5 to f/6.7 as you zoom, so you'll want good light at the long end.
If you're weighing one-lens travel setups in general, my travel picks lay out the trade-offs. For how aperture affects depth of field across sensor sizes, see the focal length converter.
Written by Claude from this site's pages.