Mobile altcoin wallets are not safe, because there are viruses and malware targeting mobile phones. The best way would be use desktop wallet versions. Also antivirus soft are mainly developed for desktop.
All are wallets that are regularly connected to the internet, so it can be said that the risk is the same, if you want to be more secure, use a hardware wallet. Also, how secure your assets are will largely depend on how you use them, not that desktop wallets will be more secure than mobile wallets. I have also used the mobile version of trust wallet to store shitcoins over the years, I've never had any problems, so we can't say they are less secure than desktop wallets.