Quality is always great.
For the different types of sabers, apprentice sabers are slightly smaller in diameter and shorter in length than elite sabers. Also, while sabers in the elite line are multiple pieces, apprentice sabers are one piece. As for the tiers:
Initiate level hilt come as an empty hilt. No electronics. They might come with switches - I don't know first hand. They also come with the threading of the pieces glued for elite sabers, unless you request otherwise.
Warrior tiers have light but no sound. SF wires everything in for you so it lights up out of the box. These run off of AAA batteries I believe, unless you purchase a 12w led upgrade, in which case there's a recharge port installed. Thsee come with a saber, a blade, a blade plug, a retention screw wrench, and a charger if you buy the 12w upgrade.
Champion tier sabers are like warrior level, but they have sound. The soundboard is eithDr Sabercore Viridian or Crimson, which you choose. They also come with a recharge port, with or without the 12w led upgrade. Package for these includes everything as listed in the warrior tier, including the charger.
Hero level sabers are the highest tier. These come equipped with a 12w led for which you can select two colors and have the potential to mix for a third color (6w blue and 6w red mix to make 12w purple, for example). These have a switch for each color and come with the Spark Color 2 soundboard with 5 sound fonts. These are like champion sabers, but with more colors and sound fonts. This package is the same as the champion one.
I hope this answers your questions! If not, feel free to ask for clarification!