Hi Minie,
I think your GG Supreme is completely unique and different from anything in your Gucci collection (even your WOC). I agree - the monogram with the taupe suede gives it such a vintage classic look. I think it's a totally different look from the black leather version (also beautiful).
If it goes with your wardrobe and the chain isn't too taxing I would definitely keep it. This sounds silly but maybe wear it around the house for a bit and see how the chain feels. I realise the WOC chain is smaller but they're made of the same hardware so I'm surprised it feels like an issue.
As I said earlier on when you were deciding, I wish I didn't love the bag as much as I do because I have more VERY expensive handbags on my wishlist and want to keep the size of my collection as manageable as possible (10 or below).
No matter how many times I line up my bags to decide which ones I'd consider selling to fund/justify new purchases I just can't conceive selling it!! For me, it's a forever bag!
It's part of Gucci's classic line. Even if you decide to sell it later you'd get a lot of interest for it.
Good luck deciding.
I'm not sure what makes the bag heavy, the chain isn't that heavy, maybe the bag?, it just that it gets heavier when i put things inside.
Anyway, after wearing it around the house, it gets better. Starting to get use to the weight and chain.
It is indeed a gorgeous bag!! I'm loving it more now than i did when i unboxed it. happy that we can be bag twinnie