Depends on what the goal is. If the goal is maximum speed weight loss, like say preparing for a competition, lower calorie easily wins. It has to be done caref

Depends on what the goal is. If the goal is maximum speed weight loss, like say preparing for a competition, lower calorie easily wins. It has to be done carefully to not get dehydrated or remove micronutrients. And it's hard to get started for most as hunger is strong early on if you don't put additional protein in. Keto on the other hand is easier to get in with but relatively hard to maintain due to social factors. The diet is extremely different from any typical one in any country. On the other hand if you just have to limit calorie intake, things get easier to mix and match. But this one is sort of automatically playing on satiety which helps. Health results are somewhat of a tossup. Source: done the Kwaśniewski version of keto, and ad-lib vegan too (ineffective). Currently low calorie controlled, data driven, successfully so far at 0,75 kg/wk.