You will probably get a number of different opinions and I am certainly no expert. I consider public WiFi and email to be the least secure connections. I won't use any of my secure passwords over public WiFi nor use any credit cards over WiFi or email. The most secure connection when traveling is a cell phone network connection. If you have more than one device, you may be able to create a WiFi hotspot using your phone and connect your other devices. I don't think that any connection is really secure, but Apple devices appear to be somewhat more secure than others. The fact that Apple apps are supposed to be downloaded from the App Store makes it more difficult to get malware. An App that is downloaded from somewhere else is more likely to be infected.