Thank you everyone for the responses!
If I create a footprint on my computer, I'd like to take advantage of that footprint on my mobile device. This boils down to passwords and search history.
I'm new to the Opera ecosystem, but it seems to be a common practice that these products are going to take advantage of what they can from the other Opera products.
GX is going to have core features that only GX can do, but for the features that are supported by the other Opera browsers they will sync nicely.
The sync link is a good read for understanding how to make sure my browsers are configured so thank you for that reference!