Jagdtiger does only offer Panzerfusiliers as another plus. Those can become killing machines at high veterancy levels. However, they do not contribute to enhance the AT capabilities or efficiency of the Jagdtiger itself... if you count their weird AT nades out that trigger way too slow to prevent mediums from encircling your Jagdtiger.
The Jagdtiger does have the added benefit of being able to be surrounded by cloaked ATGs, which can really make the Allied team take a miscalculated dive unless they are using recon planes. Panzerfusiliers AT grenade is slow, but with vet2 it's also by far the longest range snare in the game (about 25 range) so you'll always have a good chance to tag a tank as it drives along.
And their flares have really good synergy with the Jagdtiger, although it costs a lot of munitions.