Theoretically Retatrutide is “the most powerful” option, but not necessarily. Your needs today could be vastly different than your needs months or years down the road when Retatrutide stops working for you. Your body may need the glucagon agonist the most right now but as you near your goal weight and maintenance, you may only need the GLP-1 agonist. Or you may need to add an amylin agonist to the mix.
Also, some food for thought, Retatrutide isn’t on the market yet and there are quadruple incretin agonists coming through the research pipeline right behind it. In particular, NA-931 (bioglutide) seems to have a lot of promise.
My personal justification for going from Semaglutide to Retatrutide is the same as why if I’m buying a new computer, I go for the best model I can afford. New technology will follow over time so I’ll take the benefits of the new technology until it no longer works then pick the next better that comes along.