I know on my PSR-E433, the previous model to the E443, the XGLite voices are low in volume -- some absurdly so. While the XGLite voice set does provide a number of useful sounds, you almost always have to boost the volume to use them -- and adding some chorus and reverb also often helps fatten up the sound. I think Yamaha corrected this on the later versions of the keyboard, such as the E453 and E463.
Usually, the main "panel voice" version of a sound that is duplicated in the XGLite set will sound better and fuller than the one in the XGLite set. But with either of the voices -- either the main panel voice version or the XGLite version -- one of the great advantages of these keyboards is that you have the filter function, so that if it sounds too "twangy" to you, it is possible to reduce the filter cutoff or resonance to see if that makes the sound more to your liking.
I know I used to use the bright piano voice a lot, but then when I listened to some of my old recordings where I used that sound, it seemed a little too "heavy", and so I'm now leaning more toward the grand piano, but with a little reverb and chorus, and the ability to brighten it a LITTLE with the filter settings if need be.