The difference between them is that the former's charging efficiency is faster and more efficient than the latter.
For example, we take a 4500 mah mobile phone, respectively, with these two flash charging, the former only takes medicine for about half an hour, both can be fully full, the latter to reach an hour to be fully full, so the former efficiency is far better than the latter.
The difference between 55w and 33w is the difference in charging power, charging speed is not the same, the higher the general charging power, the faster the charging speed will be. The speed of 55w flash charge is relatively faster, charging a 4000 mah battery for about 1 hour. And 33w charge a 4000 mah battery about 1 hour 40 minutes. I personally like phones that charge faster.