I have been to Iceland Norway Finland to catch the northern lights for the past three years.
Norway > Finland > Iceland.
Norway Finland northern parts of these two countries fall within the aurora oval. Which is the region where aurora activity can be seen. The aurora oval cuts across northern parts of Sweden (e.g Abisko), Finland(e.g inari) and Norway (e.g. tromso), which is why people can see aurora dancing above in the skies.
The same aurora oval can be found on the southern pole, but due to the inhabitable nature of the southern region. Only ppl working in these hardly accessible places can see the southern lights. It takes geomagnetic storms of at least G1 to be able to see aurora from Tasmania or New Zealand. Cos as the aurora activity intensity increases, the oval belt expands. Therefore most of the time southern lights are photographed far out in the horizon.
Recently the G2/3 storms made it possible to see aurora near New Zealand.
After saying so much, tromso n Lofoten islands are the best places I been so far to see the aurora.
Best months to visit is sept/Oct and Mar/apr due to equinox, where the magnetic fields of sun and earth align, aurora activity will be more easily triggered.
Wow I see, thank you for your input, is it better to go to Iceland or Norway to catch it? After doing some research, Norway seems like a better option. Too much info grrr