Just because a CD is remastered doesn't mean it will sound better. As mentioned, the current fashion is to maximize the loudness level by reducing the dynamic range, which involves digital manipulations unforseen when CDs were developed. On top of that one may find aggressive digital noise reduction. The result is a remaster optimized for listening in a car, or on earbuds, but not necessarily pleasant to listen to at home.
But remasters can also be improvements on the original CD - using better source tapes, and more tasteful mastering choices and better mastering gear.
Unfortunately it's hit or miss, and the consumer can't know for sure without doing a direct comparison. The 'loudness wars' began circa 1990, and it's gotten much worse since the mid-90's. The 'golden age' of remastering is therefore probably the late 80's/early 90s. But even today excellent remastering still happens.
Don't worry about durability. Whoever told you that CDs 'lose their quality' and corrode after 10 years, is full of it. Tht would only happen on a shoddily-manuifactured disc that wasn't sealed properly. Your CDs will likely outlive you. I've got CDs that I bought in 1985, that still play perfectly.