Most savings accounts have tiered interest rates that require customers to fulfil multiple requirements, from salary credits to minimum credit card spends. By contrast, the Cash+ projected return of 1.5% p.a. applies on all your deposits, with no additional criteria you must fulfil.
Additionally, Cash+ provides daily accrual of returns, unlike savings accounts. This means you get to keep whatever returns you accumulate when you invest in Cash+, no matter the duration.