I bought and use both.
F10SC is a great disinfectant. Think Lysol, but safe for reptiles. I use it on my weighing tub, transport tubs, or basically any surface that a reptile has made brief contact with that looks clean but may have germs. I also use it to disinfect crested gecko enclosures/decor after cleaning them with plain hot water. I've heard you can put it (diluted properly of course) in a fogger to treat respiratory infections.
F10SCXD is what I use on anything that is visibly dirty or obviously very germy, like dirty ball python tubs, rat thawing tubs, and feeding tongs. The extra detergent makes a difference when cleaning blood, poop, urate.
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