can't add value on the single parent side because I'm not one, however...
Isn't quality of life about lots of aspects to life all combining to achieve a happy outcome. If you move here i assume you will have no family for support? and also, initially, no friendships etc? i think that could be quite isolating for you both, certainly initially but potentially long term.
I gain an enormous amount of satisfaction and happiness from the environment and surroundings living here in Australia but it wouldn't be enough for me to overcome the isolation from the balance of my family if I didn't have almost everyone here.