Who would win?
In this case, we have to look at each exponent carefully.
In DGSD, You Tanzhi has NEVER fought a powerful weaponed exponent. It's been proven that if you make physical contact with him, and you have significantly less internal energy (which is the case with SWORD GOD), then you'd be screwed.
However, it's a different story if you attack him with a weapon. SWORD GOD was able to easily inflict an external wound on Duan Yu's chest. SWORD GOD wasn't even trying to really injure him. Who knows if Duan Yu would still be in one peace had SWORD GOD gone all-out. Duan Yu was stated to have more internal energy than Xiao Feng and Jiumozhi, so he would not be any inferior to You Tanzhi in terms of internal energy. If Duan Yu's auto-protect cannot protect him from a simple attack from SWORD GOD (which was the case in the novel), then You Tanzhi would not be able to do so either.
SWORD GOD would not be so stupid as to meet You Tanzhi's palm head-on, since his specialty is the sword after all. The only way You Tanzhi can win is by speed or if he can land a hit on SWORD GOD. But if SWORD GOD lands a hit first, You Tanzhi can probably say bye-bye. And by the way, You Tanzhi probably sucks at dealing with weapons since he has no experience with so.
So, I ask yee, who would win?