Speeds and coverage are mostly better right?
Average data throughput is generally better with Singtel in most locations. Coverage is really going to depend on your location(s), but Singtel probably does a little better at least if you're counting 4G and 5G combined. However, don't be surprised if your phone flips to 4G in hard-to-reach interior spaces like car parks and lifts. If you're addicted to the number "5" on your phone, you may be disappointed on both networks.
OpenSignal has a
December 2025 report to provide some insights into the respective networks. YMMV.
One point that's occasionally important is that SIMBA doesn't employ different QCI values depending on which plan and brand/subbrand/MVNO you have. Everyone not named SIMBA does. Basically, if a high paying business subscriber (or VIP) needs the network, that subscriber is going to get priority over you. Which doesn't often matter, but it might on occasion.
And as for 5g, hi! should have true 5g SA vs simba NSA?
Singtel has much more 5G SA deployed. SIMBA is reportedly only "dabbling" in 5G SA at this point in time. The SA v. NSA question has been much debated, but currently it doesn't matter much. You might get a little faster call completion on a 5G SA network, but that's not a "rock your world" improvement.
You can try another network using a temporary number then port your number over later. It's not expensive to trial a network.