They are both different things and they serve different purposes. Height-adjustable laptop table is one where you can set the height according to your eye level.
Angle adjustment means the tilt angle of the top of the table, it can be adjusted to make you feel comfortable while using it on a bed or couch.
Most of the laptop tables have height adjustments and few have angle adjustments. However, a very few have both height and angle adjustments like Tormeti. Having both adjustments is a great choice but you can go with any adjustable table as long as it makes you comfortable.