There is no single best weight loss or weight management solution because no two people are alike.
Yes, some strategies have a lot more successes and/or science behind them, and you can (and should) use credible evidence to give you direction and inspiration. Just realize that even if you're doing the exact same thing as someone else, your results could be different (better or worse).
Authors of diet books and people who have lost weight tend to be excited about what worked for them, and they think that everyone else should be doing the same thing. But if you're trying to follow a particular popular strategy or diet and you feel terrible and/or just aren't losing weight, you should try something else because it clearly isn't working for you. It's not necessarily a "bad" strategy -- it's just not right for you.
Get the advice of your doctor, and follow common sense ... just realize that your personal goals are up to you, and what is actually working is more important than what "should" be working but isn't.
Keep in mind: