All totally different strains. Not familiar with pineapple chunk, but slh and LSD I know very well. LSD is more potent, some think it is too intense (I'm still looking for something stronger personally), and will zone you out more than give you any psychadelic visuals. The plant yields just okay, and is fairly nute sensitive - more so in hydro than soil. The buds taste like fresh pumpkin and are awesome. SLH is easier to grow, yields more, can take very high EC, smells/tastes like lemons (which is amazing at first, but not every day), and has a high that is both potent for experienced users and will not freak out newbies either. It is a calm happy high with minimal couch lock, but never crosses the line into freak-out high. SLH has more "bag appeal", while LSD would be favored by more hardcore smokers. Both great strains!
Oh, both have similar growth patterns and need to be tied to multiple stakes, or a stiff net. I highly reccommend topping early and bending each branch horizontally to maximize yield and have control over height which would be very tall untrained.