#1 The time to kill using Hard light is .07 seconds faster then Thorn.
#2 Hard lights secret perk gives you a speed boost faster then Mida Multi-Tool.
#3 Hard lights rounds penetrate Titan bubbles.
#4 Hard light has the highest critical head shot damage for an auto rifle.
#5 Hard lights rounds bounce off walls giving you an advantage when spraying.
#6 Hard lights rounds deal a higher damage after the ricochet
http://frankly.pitas.com/
Link above shows statistic comparison ^^
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Hard Light will be even better after the 2.0 update.