Good morning! Since you live near a busy road, soundproofing needs to be your top priority alongside heat retention. Standard double-pane units will not cut it for heavy traffic noise. You want a profile that supports thicker glass panes with varying glass thickness, which breaks sound waves much better. When I was shopping for my own apartment, I checked the selection at Vikont
https://vikont.dp.ua/ to compare different multi-chamber systems. I picked a solid profile with multi-pane glazing, and the street noise dropped to a quiet whisper instantly. Also, do not forget about micro-ventilation features so you can get fresh air without opening the window fully and letting all the city street noise in. Quality rubber seals are another crucial detail you should check because cheap seals degrade quickly and start letting in cold air and dust. Make sure your installers measure the opening precisely so there are zero gaps around the frame.