SA theoretically should have better coverage and faster speed compared to NSA because NSA runs on 4G Core Network

But here’s the thing, DNB is built on a brand new core network and then connected to telco core network
Nowadays if you noticed many telco 4G ping on a fiber-ed tower is quite low (16-18ms), means telco 4GC is actually quite good already

Thus it doesn’t really make big difference for SA vs NSA at least for DNB, the only thing I noticed is SA will provide better coverage on N28 because when in fully SA the 700MHz is running on NR, which provides beam capability and thus the network coverage is more wider.

Since all the underlaying bandwidth are the same, it shouldn’t make any huge difference like additional 200Mbps+ speed unless the telco do network slicing on the SA network which makes your device the priority one (refer to Yes 5G Network Slicing Test), where this means others user on the same network will be deprioritised as they share the same spectrum

Correct me if I’m wrong and no the signature photos is from a public area