Definitely a tough question considering how many of them there are...
I think my FAVORITE FTD of all-time has to be THE JUNGLE ROOM SESSIONS. Of course, the upgraded ELVIS TODAY album is another top pick and personal favorite of mine!!
Other top FTD favorites of mine (in no particular order) are: ELVIS NOW, ELVIS (FOOL), SPRING TOURS '77, ON TOUR - THE REHEARSALS, ROCKIN' ACROSS TEXAS (book & 2 CD's), SUMMER FESTIVAL, NEVADA NIGHTS, FROM SUNSET TO VEGAS, HIGH SIERRA, and SHOWTIME!