IB cares about, in order:
1) taxing authorities
2) exchange authorities
3) Thom. Peterffy
4) IB's institutional accounts
5) IB's retail accounts.
So!
(Do you notice where you/we fit on there?)
The thing about the F/A accounts (so poorly described by IB) is that there is *some*, READILY IDENTIFIABLE, tax-liability party indicated. (Like, a Social Security/TaxPayer ID in the U.S.) That's it, really. Give 'em a bank account of whomever will be the owner. Someplace to direct the IRS paperwork. They'll be good. Any choices for you will probably be tax liability driven. (And thus, the 'best' answers may vary by calendar year and even tax regime. Meh!)