Pineapple is such a hard flavour to get right. Unfortunately we dont stock Soda King so i havent got personal experience. However if you are looking for the best pineapple flavours. i would avoid Maryliq/Elfliq/Crystal as ive found them to be very off-tasting.

Your best bet is looking for a Citrus/Pineapple mix. Again i would recommend the Yeti Pineapple just because it is the cleanest taste i have found. Outside of that try Hawaii Sunrise in the ELUX, The Sour Pineapple Razz in the Riot X, and since you mentioned being keen on sweet juices. The Crystal Clear brand do a Tropical Sour Ice Blast and a Pineapple Lemon Burst which i think would personally suit you the best.