My view of alloys is more of function than form. Stiffer rim, wider tyres need a alloy rim for better contact patch, better stability, cornering and braking. If they look good, its a bonus.
For the Baleno Zeta and Alpha specs, replacing the alloys is a waste of money IMO. Unless the NEXA is doing it at no or nominal cost. Mine wasn't willing to, so I stuck with the stock alloys. However, Detla owners can definitely think. However, as a Delta owner, you have lot better options from outside
Ameyam