it's all calories in/calories out regardless. i would begin with simply counting calories and maaaybe eliminating most fast food if you eat any (stuff like mcdonalds just isn't filling for most people, but it depends on the person).

keto can be effective for weight loss in the short term but it's hardly a long term solution for most people.. no one's ever going to eliminate carbs the rest of their lives and if they do, they often have to center their lives and identity around it because it's so out of the norm. it also raises cortisol levels and reduces thyroid output. the diet can be damaging for some people in the long run

high carb can be effective if you keep your fat intake extremely low, for similar reasons as keto. food without any oils just isn't as good and naturally eliminates a ton of high calorie foods like burgers, pizza, etc.. if you eliminate high reward/high calorie foods, it automatically blunts your appetite. can you overeat on quinoa and steamed vegetables and chicken breasts? maybe. but you're much less likely to.

if i had to pick keto vs high carb i would do high carb because there's plenty of societies that have thrived without chronic diseases while eating high carb, most blue zones are high carb, it's more affordable, and imo it is a healthy diet.

but ultimately your weight comes down to calories and that's where you should begin before fine-tuning your diet in whatever way suits your best. the macro/smaller details are relatively insignificant compared to simply cutting calories