GT-AC5300 Band steering which setup is best

Can someone advise which setup is best: I am not using MESH.

Setup 1
2.4 - 5G-1 - 5G2 ALL SEPARATE BANDS

or

Setup 2 - 5GHZ Band Steering
2.4 separate band
5G1 and 5G2 - as one SSID with Band steering

or

Setup 3 Band steering all channels
2.4 - 5G1 - 5G2 - ALL same SSID