Honestly I think either would work fantastic with your current collection.
I think it's more about introducing a new designer (aka Tiffany) vs going with what you know or already have (the VCA).
Personally I like a little diversity and would go for the Tiffany.
I also know that when the VCA guilloche scratches it cannot be polished. LVloverCC on Youtube has one and she's a mother as well. It has definitely shown wear and tear and doesn't shine or reflect light as radiantly as the pendant version.
So, as long as you're aware of that, then that's something to be expected.
Just my 2 cents, again, I think they'd both work beautifully with what you have. Happy shopping and please let us know what you end of getting!
I agree and think the Tiffany would be a bit better to round out your collections with a different brand.
The hardwear would also stack better with the love and juc if you choose to wear it all on one wrist, especially because it’s less likely to get caught on the nail compared to an Alhambra bracelet. It also fits with an industrial theme.
The guilloche will probably scratch some as a beverage, but I don’t know if that would bother you. It may be more noticeable if you are comparing it with your pendant, however.
I love hardwear. So that's my vote. I have a friend with similar jewellery as you and she chose a medium hardwear for her right wrist. She loves it and I think it looks great on her to have that contrast of hard bangles on one wrist and flexible chain on the other.