Shows with lasers include:
- Star Wars
- Star Trek
- Babylon 5
- Flash Gordon
- Battlestar Galactica (1970's)
Meanwhile, shows with bullets include:
- Battlestar Galactica (2000's)
- The Terminator
These lists are not exhaustive, yet they are enough to point to something. Bullets equal gritty. Bullets imply realism. Meanwhile, lasers imply fantasticalism. (Is that even a word?) Shields, energy, and whiz-bang rule the day in the laser SF genre.
Note that I'm not taking sides on which is best. Bullets vs Lasers is a tool to tell your watchers what kind of show they are watching and what they should expect.