It's better in a lot of ways. First, you don't xurn it. Second, it can cause DoT when upgraded. Finally, it has a better noise. (animation on tlw is better though) I'm ready for the hate.
Edit:bought tlw, and it's impressive.
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TLW is better because of it's TTK, if you land two headshots you can kill someone in just a couple of seconds. Thorn is still top tier but TLW is still better in my opinion