That’s actually a really great point in favor of IB! Thank you for that 
If I go with Degiro, I will have access to VWRL, which is IE domiciled.
But going with IB means that I could use VT or VTI+VXUS and benefit from the optimised taxes thanks to them being US domiciled fonds. Relevant thread
Did I get that right, or have I missed something?
By the way, what’s the full name of IBKR? I suppose it’s InteractiveBrokers, but what’s the KR behind it?