Not all slides are equal. There are people who break anything including slides.
If you plan to overload or max the weight in the slide compartments, are large people, open when not mostly level, you will put more stress on the slide wall. Keep in mind the slide wall on a TC is quite small compared to almost any other TC. That being said, my TC is 12 years old with zero slide issues for either one. Other people with the same brand/model have destroyed theirs. I only can guess why.
The only way to see the difference in space is to go into one. For us, two slides is much better than one, ymmv. Either way, compared to a normal size TT, a TC is very small. If you want significantly more size, you probably want a different type of RV.