Stream Line is a lubricant only. Lubricating a line is awesome because it improves casting distance and accuracy. Fishing guides have been known to leave a bottle in their boat to give their clients any advantage that they can.
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https://loonoutdoors.com/products/stream-line
Scandinavian Fly Line Cleaner lubricates a line but also improves floatation. This means that it improves the presentation, makes mending easier/more effective, and provides an overall better fishing experience.
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https://loonoutdoors.com/products/scandinavian-fly-line-cleaner
Line Speed does all of the above but also conditions a line and provides UV protection. This means that not only will you maximize your line’s performance, but you’ll also make sure that line lasts.
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https://loonoutdoors.com/products/line-speed