The first one is a set: BLF A6 (3D tint) with charger and batteries
The second one is just the flashlight. BLF A6 with options for source (China Warehouse of U.S. Warehouse) and choice of tints (1A, 3D, 5A).
The third one is the same flashlight, but without any finish coating, bare aluminum.
- Bare aluminum advantages: Bling factor, looks nice.
- Black anodized finish advantages: Hard coating resists staining and scuffing, allows for tail lock out (power cutoff).
The fourth one is identical to the second one.
The fifth one is the Astrolux version (different brand) of the BLF A6. For most intents and purposes, you can consider the two flashlights to be identical. This particular deal comes with both an 18650 tube and a 18350 tube, which means the user has a choice of powering the flashlight with either the longer 18650 battery or the shorter 18350 battery. So, it’s a better value (if you don’t care about the name).
In all cases, I cannot recommend this flashlight to you. If you have difficulty comprehending these differences, I’m concerned for your safety.
See:
Lithium-ion battery safety 101
EDIT: Sorry for re-stating much of what EyeballFryer said. It took a while to reconstruct the OP’s post so that the links worked.