I have been surveying this. Best aesthetic door is aluminium glass door. It will cost RM600 onwards. Bi folding door ranges from RM300 onwards. Bi folding door does not give me a strong lasting door impression.

In between, I installed solid metal door, all bathrooms and one back door. Price is RM450 onwards supply and install. Color available is only white and beige. Only available in KL.
It has good impact resistance. Construct of water proof materials. I expect it to last forever.

The metal sheet is treated, bro. Similar construction is applied to cold truck.

BTW, I never like folding door.

RM450 per piece onward. The door is custom made since there isn't any standard size door.