I concur costodian fees charged by Bison and BiG are vey similar:
BiG
Subscription fee: 350k x 0.15% = 525 € + 23% VAT
Annual custodian fee: actual value x 0.1% = ~350 € + 23% VAT
Bison
Subscription fee: 350k x 0.2% = 700 € + 4% stamp duty = 728 €
Quarterly custodian fee: 350k x 0.02% = 70 € + 23% VAT = 86.1 €