I think you are mistaken about SeatGeek. They were founded in the US, and are based in New York. I think the founders are from Philadelphia. Although they are venture-funded, as far as I can tell, most of that venture capital is from the US. They are expanding internationally, and have acquired some overseas ticket websites, but that is different than being based overseas. (By the way, the same is true about StubHub. StubHub was acquired by London-based Viagogo a few years ago, and the combined company was renamed StubHub Holdings, based in New York.)
As far as providing bank information, SeatGeek only seems to offer direct deposit as a payment option. But as far as I can tell, you can't even list your tickets without providing your bank information to process payment. This is an advantage of StubHub, where you can be paid via direct deposit (you also have to provide bank information), via PayPal, or via a prepaid credit card.
As far as providing your SSN, this is an IRS requirement. Starting in 2023, ticket resale sites like StubHub or SeatGeek have to issue a Form 1099-K for tax purposes. They need your SSN or TIN to comply with this law. Additionally, both StubHub and SeatGeek have to comply with federal "know your customer" rules regarding anti-money-laundering and anti-terrorism. Both platforms can use your personal information to comply.
As far as BBB ratings, I see a 1.05 F rating for SeatGeek (
https://www.bbb.org/us/ny/new-york/profile/event-ticket-sales/seatgeek-0121-117089) and a 1.04 F rating for StubHub (
https://www.bbb.org/us/ny/new-york/profile/event-ticket-sales/stubhub-inc-0121-87159166). I'm not sure the difference is meaningful (plus I question the reliability of BBB ratings).
Based on the above, I don't see much of a difference in risk for using SeatGeek vs StubHub (other than StubHub offering additional payment options).
Beyond the above, I think the main advantage of StubHub is that it is larger, and has a larger customer base. So there are many more potential buyers who will see your tickets for sale on StubHub (pus the additional payment options indicated above). I think the main advantages of SeatGeek is that they are affiliated with Rutgers, which makes selling your tickets a lot easier, and their fees are lower than StubHub so the price is lower to the seller and you get more of the money when your tickets sell.