I think it clears the doubts:
16:9 Vs 16:10
16:9 perfectly displays Full HD.
16:10 stretches or distorts images to meet Full HD signal. When a traditional 16:10 LCD monitor handles 16:9 signals in generating Full HD image, there are usually two ways to get it done. The first way would be to stretch the image which results in picture distortions. Another way would be to cover up the surplus image using horizontal black bars. Either way - stretching the image by 10% or covering 10% of the image - would cause a seriously impact to quality of your visual entertainment.
16:9 allows you to enjoy the entire image.
16:10 creates visual interference with the black bars.
16:10 advantages:
Higher resolution for the same ppi and "
More vertical resolution
Higher resolutions for 1280·x, 1920·x, and 2560·x
Wider range of resolutions (as of now), including high-res 15.4" 1920·1200
17", 20", and 24" displays have higher resolutions (both ways) than 16", 18.4", and 21" 16:9 displays (except for 1920*x)
16:9 advantages:
Wider so no "black bars" when watching 16:9 movies
Wider so easier to display two things side-by-side
Cheaper panels
High-res 13.1" 1600·900 panel has no 13" 16:10 equivalent
Can fit a full-size keyboard in a smaller display size
16", 18.4", and 21" displays are physically wider than 15", 17", and 20" 16:10 displays for similar heights