Apart from appearance, the main difference seems to be the filter.
Both of them seem to have media which you don't actually need - in common with just about every other filter out there. With both of these tanks, I would replace everything except plain foam/sponge with more foam/sponge.
The Water Clear media are just carbon which is not needed full time.
They don't say what's in the Bio-Bact media but the fact that they say it must be removed if medication is used is not a good sign. They say it's a biological medium but there must be something else in there as well if it has to be removed when medicating, and it's possible it'll also remove plant fertiliser.