Different model phones and even different phones of the same model have differing reception. If the phone is in specs, there's nothing that can be done. If it's out of specs, I don't know how an individual can prove it. It might do some good do file a service complaint. Maybe?
I doubt this is related to the S10 reception issues. Bad reception on Sprint primarily but alao reported on just about every other carrier is consistent across the board for those experiencing issues.
This is a fairly new radio for devices. It will take some time for Samsung to get them fine tuned for the best oerformance on each carrier. Have you tried another device with your SIM in the area where your service is loor to see if the reception is the same or better?