I know you didn't know but dammit Vel, pitting my two favorite verses against each other. As for the fight itself, let's see both sides advantages.
Sigurd -
1. Out skills Gin easily with a dagger (Did exactly this against Holmes and pseudo Galahad (similar to Gawain and Lancelot). Can beat god-murdering Bryn at max love. Weaker Bryn is equivalent to the
better Arthur). Just wait til he uses his main sword.
2. Scandanavia and runes amp both AP and Durability.
3. Magic Resistance makes Kido irrelevant. Runes make them more irrelevant.
4. Can do all the other things Bryn/Cu can do with runes (freeze things, burn things, summon meteors, fly, NP level barriers, track, forced fight, seeing the future, illusions, possible instant death).
5. Theoretically limitless stamina, also allows him to potentially spam the cooler Excalibur.
6. Sexy glasses, 'nuff said ... oh and they amp his already high awareness and gives total recall for a bunch of useful and useless info.
Gin -
1. Greater range
2. Initially higher AP/Durability
3. Higher attack speed
4. Potential one shot with Bankai (needs to be in Gram-range for Korose gg).
As much as I would like to give daddy Sigurd the win, Gin is gonna go for his Bankai before Sigurd punches a sword at him, likely ending the fight then and there. If he somehow survives, it is well within his ability to back off, heal and nuke ftw. Sadly I don't see it happening much. Gin 7.5-8/10.