Hey there, great question… In my opinion the answer varies depending on the persons current situation and fitness goals.
In general, long term diet adherence is the end goal, when choosing a dietary strategy. I view keto as a “tool” to be used in certain situations. As a rule, if you looking to gain muscle mass and strength as a ‘non enhanced’ athlete, for various reasons… i dont use keto most of the time unless im looking to have the person drop water weight as a last phase of prep.
As a lifestyle dietary approach, i find keto to be useful for a person that needs to drop a LARGE amount of body fat 100+ pounds and restore certain health markers. However, once the person is in closer healthy marker ranges, i ease them into another dietary strategy.
hope this helps