I find that 5G can be patchy sometimes due to it still being pretty new in most network's infrastructure.
One has to be near a 5G module and other conditions such as weather etc needs to be optimal too.
How's connection on 4G / 4G+ etc ?
I ended up turning off 5G due to the way it is a resource hungry connection on the phone's battery ,and I really don't need to download large files faster.
Apart from carrier aggregation and 5G I find that 5G does not vastly improve surfing speeds.
That said I appreciate for you 5G appears to be important and there is some merit in the thought that some phone's can sometimes connect better than others.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "