The Android wallet with password is fully encrypted so is pretty safe (as long as you store/copy the recovery phrase in a sensible way that it won't be compromised). For the most part they are equivalent in terms of security.

The main difference I guess, is whether your desktop computer or Android phone are more likely to be compromised by hostile software, as this would be the only threat to either, from this perspective it depends a lot on usage patterns (whether the Android phone is rooted) what sort of apps you install on it etc.
As a general rule of thumb I'd say on average that the average desktop computer is more secure than the average mobile phone. For a reasonable amount of coins I'd not be too concerned, if I were storing my life savings then perhaps it would be a bit more concerning.