Thank you all for advise.
Actually, what I learned somewhere on this site, that, seatguru.com has old version of A380 and not the latest aircraft which emirates has. I saw recently on emirates FB site, that they have replaced existing with new (upgraded) A380. So, I think seatguru.com might now show the real A380 airbus flying to AU.
I like window seat because I notice that myself feel more relaxed when I see the day light. This keeps me active and relaxed. If I will not sit on window then I think I will feel bore and lazy. Therefore window seat is must in my case.
I think I should leave the decision until check-in. And will try to reach early at airport to finalize reasonable seat selection at time of boarding pass issue.
Thank you again !!
Bye,
Viki.