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With LWD you have many more details on drilling environment and formation. You can measure vibrations to avoid waste of energy and misuse or fail of your BHA, pressures (internal on drill string and annular) so you can manage and improve drilling, gauge and caliper the well on real timel, and off course the direction and inclination of the well.
As for formation you have tools that can mesaure all petrophyics characteristisc directly or indirectly. The mais measures are gamma ray, resistivity, slowness (sonic), porosity and density. Mora advanced tools also measure pore pressure and perform a "while drilling well test" measuring drawndown and build ups. Some of this tools may even colect samples of fluid as soon as a particluar section of the well is drilled preserving better reservoir conditions and giving more accurate data.
MWD - meausure while drilling (inclination, azimuth, depth - DIRECTION), LWD - logging while drilling - getting information about formation type, with applying different environmental corrections
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