Haha, I'm not Mr. Chang. His name on T11 is Liquidsn.
In terms of using your riffle stacking in an actual live game, then yes, stud and draw are a bit obsolete and hold'em is the current game. However, in terms of gambling demonstrations, I still believe performing your riffle stack for a 5 card hand game like draw or stud would be your best bet, as it caters to a wider spread of generations.
That being said, if you are wanting to seriously practice riffle stacking for use in a live game, then your practice is going to involve more than just riffle stacking. You will have to learn how to use the cut and the strip to complete your stack as well. In addition, you will most likely be working with someone, thus not dealing the stacked cards to yourself, so your math will need to be spot on. You will have to learn how to control different amounts with the strip and riffles depending on where your partner is on the table, and if you are dealing the extra cads on the flop, turn, or river.
However, if you are putting in the time to learn riffle stacking, you should learn how to do it for a 5 handed game and controlling a four of a kind. Just because the games are now a bit obsolete, doesn't mean the practice is extremely valuable. Why stop halfway be less capable than others?
I have been practicing riffle stacking for nearly a decade now, and I can tell you that learning how to do a 5 handed game like stud/ draw, has certainly been in my favor in terms of switching my stack to suit a hold'em game.