Burning CD-R media at slower than 16x usually produces results that are not quite as good with modern desktop burners and media - if the drive even allows such a slow burn (many don't).
A few drives even burn slightly better at 24x than 16x, but for most combinations of drive and CD-R media, 16x will produce the best result (in terms of Jitter and C1/C2 errors).
Laptop burners are designed for slower speeds than desktop drives, and the best results on such drives might be accomplished at a slower speed such as e.g. 8x. Few here burn a lot of discs using laptop burners, however.
Welcome to the forum!