simply look at what is in both side by side. you will see a lot of artificials and added garbage in both. i don't want to bash both products cause i know people get upset when i do, but 99% of them are no different then buying cheap ice cream from walmart in terms of nutrition.
and no you don't lose your muscle between meals, that is just made up grift-science they came up with in the 80's to surprise! sell meal replacements and protein powder to naive 20 somethings trying to be 'like arnold' . being catabolic is very important in our bodies, it keeps us alive. you would die if you just grew non stop. imagine if the tree in your backyward just grew taller and taller forever, it would reach space, but it doesn't. the tree stops growing, same with every other animal or being