Looks like SA is better. But coming from a user who had been using SingTel since my very first phone until I swap to MR, I tell you, the feeling when signal is dead is deafening. At times in your heart you will feel like signal is going to die anytime. It’s like living in a time bomb.
I heard the signal strength is like SingTel > StarHub > m1.
so no, not going anything other than SingTel even though NSA might be faster.
On a side note, my above point may be moot cause it’s a mvno and considered a deprioritise SingTel. So experience might be different from the original SingTel.