Cloudy days are never good for viewing the night sky, either with the naked eye or a telescope. If it's a cloudy night or if your area is well lit at night, the visibility will not be good. That's not a fault of this specific telescope though, as even really advanced telescopes can't peer through the clouds. If your area is flooded with light pollution then you might want to find a spot away from the city where you can star gaze. If you're serious about wanting to spend hours looking at the night sky, then you'll want to find some field or something similar with a lot of open space and a clear view of the sky in all four directions.
The link you showed me seems to be the same telescope. I don't see any differences. Keep in mind that this telescope is just a common amateur telescope. Don't so expect to see things like you do in magazines and books taken by the Hubble lol. It is great for viewing the planets in the solar system (Jupiter appears to be about the size of a dime), the moon, binary stars, star clusters, large galaxies, and some nebulae.
The link you showed me seems to be the same telescope. I don't see any differences. Keep in mind that this telescope is just a common amateur telescope. Don't so expect to see things like you do in magazines and books taken by the Hubble lol. It is great for viewing the planets in the solar system (Jupiter appears to be about the size of a dime), the moon, binary stars, star clusters, large galaxies, and some nebulae.