Spaces - my favourite!
I like the easy user interface for my account. Basic data is easy to find and to use from my mobile (e.g. copy IBAN). Spaces is my favourite, I love to structure my budgets there. The only thing I am missing, is N26 to support spaces as real sub-accounts with dedicated IBANs. That would also rectify the monthly costs of 10€ for my premium account - which I still think is a lot!