Life is hard enough as it is without needless complications!
Not sure? ASK!!!!!
Please note that each options has its own set of trade-offs of security vs usability #DYOR
Is what I call it, because it is in fact 'hot storage' (ref below) that you purposefully keep offline, in order to cut out the primary attack surface.
It's a full bitcoin node that has no internet connection and does not contribute to the network security.
However, truth be told, some mobile developments are very much worth mentioning:
Have no fear: