Apertura AD8 vs Sky-Watcher Virtuoso GTi 150P - Which should I buy?

I’m choosing my first telescope and can’t decide between the Apertura AD8 and the Sky-Watcher Virtuoso GTi 150P. I live in Los Angeles, but I plan to travel to Bortle 3 skies to observe galaxies, nebulae, and planets. Is the difference in visual quality between 6 inches and 8 inches really noticeable? Is the larger aperture worth giving up GoTo and automatic tracking? I’d appreciate advice from anyone who has used both telescopes.