Help me to make decision!!!

I think youd better get LUMIA when you are up to corporate phones and get good pictures to take.. LUMIA is made like iPads and tablets which you could make presentations, reports, etc with the help of the Microsoft. Dual sims are ok if you look at it, though price wise and specs, LUMIA is better.

I'd go for Nokia Lumnia 610. Advantages: Higher pixel density at 252 ppi Internal storage at 8GB Batter life And I believe it's cheaper than Galaxy Ace Duos. But if you really need to use both of your simcards, then go for Samsung. :)

I think in terms of applications, Android is the number provider of those compared to Windows phone...but owning a windows phone is something more classy and I think is more appealing since only expensive phones have Windows...

it all depends on what range of mobile you want and most importantly the range of mobiles like samsung are best