If you are streaming on a mobile device with a limited data plan, 360p is the "sweet spot." It allows you to watch the full 60-minute finale without consuming gigabytes of data.
If you're looking for information on where to watch this episode or details about the plot, I can help with that as well. "The Serpent" is based on real events and revolves around the story of Charles Sobhraj, a serial killer known for his charm and ability to evade capture. Episode 8 likely continues the storyline of Sobhraj's crimes and his interactions with the police and his victims. the serpent s01e08 360p