(1) What is most important to you in a FFP?
Upgrades on travel, priority services when flying the airline, good award redemption rates, better award access, free lounge access
Reply: priority services when flying the airline, Upgrades on travel, free lounge access (in order of importance)
(2) How many miles do you usually fly each year & in what class? How many flights/sectors?
(<25000, 25000-50000, >50000 miles - <25, 25-50, >50 flights?)
Reply: 25.000 - 50000, >50 flights
(3) What types of fares do you usually buy?
(First, Business, Premium economy, Economy, cheapest)
Reply: Chepeast / Economy for Europe, PE for long distance (2-3x a year)
(4) Can you choose your airlines and/or class of service? Do you travel for work and/or pleasure?
Reply: Yes. Flying about 80% for business and 20% for pleasure
(5) Which routes and airlines do you fly most often?
(US Domestic, Transpacific, Kangaroo, in Asia etc)
Reply: LHR - DUB / LHR - MAN / LHR - DUS
(6) What is your home airport?
(SFO, SCL, London LHR, HKG, Singapore SIN etc.)
Reply: London LHR
(7) Do you have FFP status of any kind in OW or other airline? What is it? Do you have any miles banked in a FFP?
(AA Executive Platinum, QF Gold, UA 1K, LAN Comodoro, etc)
Reply: Iberia Oro (OW Sapphire) / BA Bronze (OW Ruby) / EB Silver. One a few miles on each of them, status is from AB status match.
(8) Preferred Airlines? Most common Airlines flown on?
Reply: BA / Aer Lingus / EW

I’m relocating from DUS to London in August and have a hard time picking a new FFP.

I have little doubts that I'll reach OW Sapphire with either BA or IB via segments. My question is whether there is a significant difference between the two programs and the benefits I'm looking for, given that I'm located in London. I already have the status with IB from the AB status match, so my gut tells me to stick with IB. I'll probably get a BA credit card in the UK so that Avios can be transferred from one program to the other.

Am I missing a crucial benefit of the BA program or does sticking with IB sound reasonable?

Thanks