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Installing a balcony is to be windproof and waterproof, and profile and edge banding glue are more important. The Yinfeng, Triumph, and hollow swing door series are all very good.
If you do two doors, the frame is more suitable according to the overall decoration material of the home.
The size of the space should be taken into account, with sliding doors taking up a lot of space and folding being relatively small. And, of course, personal preference. Refer to it.
I suggest that you can take a look at OPEC doors and windows, and if the sound insulation effect is good, pick off the bridge, aluminum alloy doors and windows or aluminum-clad wood doors and windows, and if you use glass, you can use insulating glass, which has two layers and three layers.
Charged per square, there are different prices.