I'd also suggest you continue using Smart Switch, the point being there are actually hundreds of thousands of Samsung owners who use it without a glitch. An overwhelming number greater than the isolated incidents with those who do have a problems using it. So just keep a balanced perspective.
But regarding your problems, it does sound a lot more like some kind of networking and/or connectivity issue you need to address first, not so much a problem with the Smart Switch utility. I would strongly suggest you do this project at home in a more secure and reliable setting. Hotel WiFi networks are public services and should always be used with a lot of forethought. They're not very secure and there's a likely to be a lot of content filtering/restrictions in place. Using a hotel WiFi network to do something like file transferring large amounts of data between devices might be blocked by firewalling. But really, even it was working out, you would be transferring the user account from one phone to another and all over a WiFi network that's not secure and not private, exposing all your data as they copy over from one phone to the other.
Or as others have suggested, just use a direct, phone-to-phone ad hoc connection instead of that hazardous hotel WiFi.