Hello, people
Newbie on here
On the subject: the choice is between the Llumar and 3M. But looking on the climate specific of India, I do not think 3M is an appropiate choice. 3M is fitted more for the moderate continental area, is not quite sun resisting as the sommercial says.
And, be carefull: workmanship in this case is the difference between heaven and hell (and everything on yor money!). Try a certificate service, ask for guarantee, supervise personally. And do not go cheap. In the end, if anything goes wrong, it will be more expensive.
My best regards.

well said. workmanship is the master key.