By best I mean super easy to open an account, fund said account & close account,
Answers

https://www.customersbank.com/personal-banking/personal-savings/
Yes, you do need a $25k minimum balance to earn that interest. And there are several offsetting advantages, including: (1) virtually unlimited external account linages; (2) same day transfers — if requested before 2 pm; and (3) very high transfer allowances (I've not run into any limits, with either $100k+ pushes or pulls).
I wouldn't think there'd be any difficulty closing your account, and getting your money out (unlike the horror stories we hear about Marcus, and others) . . . but you may well find, as have I, that Customers — if not always offering the very highest of rates — is, due to the points noted above, decidedly a "keeper."