This is a very common question and much simpler than you would've thought.
What's a Baselit saber?
Basically, a Baselit saber is very much like a flashlight with a tube on the end. The light is projected from inside the saber's hilt and shines upward into the hollow tube/blade. This allows for a blade that is very strong but easily replaceable.
What's a Pixel saber?
Pixels on the other hand have a strip of LEDs inside the saber's blade and the light is generated through those LEDs. This allows for more light effects and a much brighter blade. One downside is that even though we make our lightsabers to be battle ready, by hitting the blade in a wrong way, there is a chance that it could damage the internal LEDs.
So why would I choose one over the other?
The trade-off is basically durability for blade-effects and the experience. If you know you're going to be doing a lot of heavy dueling, a Baselit saber is likely what you're going to want to buy. Whereas if you're cosplaying, a collector, or even if you just want to show off a cool saber at a party, a Pixel saber will make your inner-Grievous very happy.
Either way, whatever saber you choose, it will make a fine addition to your collection.
