Even if it's just a one time stack, many people who have been on the Relic Grind like the Nexus look more than the Zodiac look. A lot of people won't grind out the same weapon twice, much less up to Nexus level for a glamour.

What I'll end up doing is Glamouring the i100 weathered weapons to Nexus before finalizing my Zodiac upgrade... I want the look of the nexus retained... But it would be even better If I can apply that look to a practical weapon down the road going into heavensward.