The most suitable window is only as accurate as its installation
https://privatebin.net/?7a1b1e64240aa0aa#AqFH1MYuSxiLDVkvsVYa5ZiGwmcPQEwqrRcYnaqXZKSR
The biggest window is in basic terms as really good as its setting up. Even useful units can underperform if flashing and sealing are flawed.