Originally Posted by monahos

From an US e-rewards account, the redemption rates into BA and IB are nearly identical, but you'll probably find the $35 monthly cap for BA limiting. If you generate enough e-rewards, better to redeem into both IB and BA (also Avios.com, although redemptions into this partner have been iffy this month - 30 day calendar won't reset), and pool all those avios into one BA household account. While household accounts don't allow transfers, you can get around it with an Avios account, or by inviting/delisting household members at redemption/transfer time.