If taking into account all the provided information, triple glazed windows are better. Their price is higher but they have more benefits. The second type of windows will allow you to keep warmer in winter without spending the same sum of money on using radiators or air conditioners to heat up your place.
Triple glazing is stronger and more secure. If you are the type of person who doesn't mind to pay more considering long-run benefits, then the second option is definitely better.
The use of just one additional
glass panel and a layer of argon gas make a big difference. Even though you will have to pay a higher price on buying triple glazing windows, you will save money in the future. Flats and house owners get frustrated paying high electricity bills every single winter not counting those wet, cold and windy days during late autumn and early spring.