Every optic does one job best.
Here is how they compare.

Riflescopes
Magnified optics for precise shots at distance. Fixed or variable power.

Red Dot Sights
An LED dot with no magnification. Fast, simple and both eyes open.

Low Power Variables
1x for close work, dial up to 6x or 8x for distance.

Rifle-Specific Mounts
AK side mounts and other platform mounts put optics where rails do not exist.
| Red dot | Close range, fast, no magnification |
|---|---|
| Holographic | Close range, laser-projected reticle |
| Prism | Fixed power, etched reticle |
| Riflescope | Medium to long range, magnified |
| Iron sights | No batteries, the backup to everything |