If I remember right Thylacosmilus has bigger fangs so i'm going to go with it

Last I checked... Thylaco had bigger fangs, more robust skull and body, and was slightly heavier.... SO, I'm going with it too... (ALSO I like it more)

6 votes in and its still a 50/50, wow.

I'm pretty sure that Thylacosmilus has a bigger jawline I think

Pretty sure it does.

Didn't know S. gracilis was so small, but it's still slightly bigger than Thylaco I'm pretty sure.

Actually last I checked, Thylaco was thee heavier of the two, with S. Gracilis being upward of 220+ Lbs, and T. Atrox being upward of 260+ Lbs...

SO Thylaco was actually the bigger of the two @Savage Almond

Smilodon will evidently win.