My take on this is that I feel it's a much better idea to LP custom Superlemmini packs that were intended to use Superlemmini mechanics, like what WillLem did with his Xmas and Superlemming packs. I feel these will provide much better exposure and marketing of Superlemmini. Even better, they're quite short packs, being only 10 levels each, and that's quite a good amount. At the same time, these both use the Superlemming gimmick, and so aren't quite the best packs to represent SL, but certainly for the fact they are intended to use SL mechanics.
If looking for a pack that intended Superlemmini mechanics to LP, I would suggest Sublems, Reverse Lemmings, or maybe even prince jamie's packs, which are far shorter. Reverse Lemmings might be a pretty good one, considering it's simply the original Lemmings with the exits and hatches swapped. I'm not saying there's anything wrong with LPing one of eric's conversion packs to Superlemmini. You still can, but rather I feel it's better to do packs that originally started off as Superlemmini packs. Sure, a lot of them started off as Lemmini packs, but there's still plenty of subtle differences between the two engines where levels can play out differently than originally intended when going from Lemmini to SL. It might not matter in most cases, but it's still something to keep in mind.
Just my take and opinion, of course.