It seems just about anything works.
I would do things differently depending on the goal. I think anywhere between 1 and 3 workouts per week is plenty depending on how much time you have. I'd only change sets/reps and exercises depending on the goal.
I've had good results doing rest pause sets as with DC training. I'd probably stick with that, but I can't because I need my immune capabilities to be optimal due to health issues. So instead, I'm stuck doing something similar to 5 x 5, where the sets are hard but not exactly HARD as done with DC training. I'm thinking of trying the sets DC style again, but inserting 2 cruising weeks after 5 blasting weeks; I think I could actually handle that.
As mentioned above, I think 2-3 workouts per week can work fine depending on how much time you have. But personally this year I was actually able to get in the best shape in over a decade with only one HIT workout per week consisting of 3-5 exercises and lasting only 20 minutes. The key was doing all sets rest pause style such as with DC training. I also supplemented with creatine in which I believe helps a lot in getting more reps. Those workouts done brutally hard with compound movements helped me to keep my muscles strong. I shed the fat away simply by cutting calories.
Most people won't believe it if you tell them they can lose fat with such little training and without the addition of cardio. I didn't either initially. I had to try it for myself to see if it would work. And it does.
The only problem with the above mentioned strategy is that it doesn't incorporate any extra activity. And as mentioned in PB, such extra physical activity is necessary for both its mood elevating affects and moderate physical activity for its immune enhancing affects.
From my own personal experience, for only aesthetic results I do believe that 1-3 workouts per week is plenty depending on your goals and how much time you have. If you don't have as much time or just don't want to dedicate the time, 1 still works great. If you're a bit more ambitious and dedicated or a competitive athlete, 2-3 might be more suitable. But one still will work well for most people.
On the side, you still need that extra low-moderate activity. And my honest recommendation is that if you have any good ideas in mind, ideally it should be anything fun that you'd do on your leisure time. Let that be hiking, swimming, sex, or what ever. Heck, even cleaning the house would be fine, but it's just not as fun. My overall idea is that your workouts should be efficient (intense, brief, and infrequent) and affective to serve a purpose, but you still need to live an active life outside of the gym for overall health.
The best advice I could ever give on this stuff is that for a good body you don't need to do cardio or to spend a lot of time in the gym; its more diet and specifically calories. But to be healthy, you'd better be leading an active life!!!