I love all of them because they offer different advantages and are useful for different situations. In an area with little cover? Blessing of light. Have more cover then you could ever wish for and just want to kill things faster? Weapons of light. Want to be near invincible? Armor it up baby. It's even better with force barrier, as it stacks with armor of light :), could sit there and watch a blade dance try their hardest if I had force barrier, armor of light, and increased strength for force barrier perk on. That's a Titan you don't want to fight against. Lucky for guardians armor of light is only inside the bubble and all other supers can destroy it.