As mentioned, both Tamiya and Dragon do the particular type of Jagdtiger you are looking for. Revell also does one, but that is simply a rebox of the Dragon kit. It's somewhat cheaper, but lacks the PE for the engine deck grills, which is included in the Dragon kit and the Tamiya kit.
Having built both, I would recommend the Tamiya kit. The Dragon kit is most certainly not bad, in fact it is quite good, but its detail is not better than the Tamiya kit, they are both pretty much equally detailed.
The reason I prefer the Tamiya kit is the better fit of parts (typical Tamiya) and easier to work with tracks. The Dragon kit comes with individual links, the Tamiya kit has link and length, with convincing looking sag to them.
If you wish, I could take some pics of the Tamiya kit, it's just awaiting paint.