To go cursed or not to go cursed....Greatwsord of Artorias question.

You can block with sword when two handed... If I remember right. Same with the jagged ghost blade and ghost blade, which I usually use threw this.

Doesn't matter. If you prefer raw physical damage, than go with the cursed, being that it lacks magic compared to normal. If you want better scaling, even spread (or close) of magic and physical, AND divine bonus, then get normal one.

Considering u have the stats to use either version i would reccomend you get the uncursed 1st and the cursed one on the next playthrough.

Wear the Covetous Gold Ring, and you'll have plenty of Transient Curses to get you through the ruins.

Honestly: you never have to worry about cursing yourself once against the ghosts. There are enough transient curses in the starting area to get you through the whole ruins. Even without more than five to pick up then you are sure to get more off the remains of ghosts.

In other words, don't go for the cursed greatsword. It does less base damage, and doesn't scale as effectively. Also the non-cursed one I believe does holy damage, which will destroy skeletons which is much more effective than being able to attack ghosts.

i may be late but as a user of both swords i know the pros and cons to each.
The cursed one favours more of a strength/dex build, and is better than the original if you lack int and faith, however, if all of the stats needed to wield the weapon are over 40, go for the original, because it will do more damage TO ENEMIES WHO ARE NOT MAGIC RESISTANT. Over Half of the original's power is its magic damage, so if you want to use that one, leveling up faith and int are vital to doing damage with it.
I liked using the cursed one until i was 45 in both faith and int, thats when the damage of the original really came out.

And i can't stress this enough: Upgrade it, the sword isn't very good until it is maxed out.