This is a question about the lesser of two evils (because both are processed foods and neither is about incidental carbs in vegetables).
Given that you should not be eating either of these - which to choose?
I would go with what tastes best.
The reason I say that is because I am assuming that if you eat the one you really want - you can keep a bargain with yourself that it will be a long time (weeks) before you have anything like it again.
If, instead, you try to go with the one that is technically closer to keto (low carb) you may feel like you are close enough to keeping with the WOE and allow it often. Similar to people on a low fat diet eating 1000 calories worth of fat-free cookies while still following their diet’s guidelines (i.e. if these people instead ate one “real” 200 calorie cookie - they would be much better off).
Note: The “Cauliflower pizza” is made of Cauliflower, Brown Rice Flour, Cornstarch, Water, Tapioca, Sunflower Oil, Extra Virgin Olive Oil, Sugar, Egg, Xanthan Gum, Yeast, Salt, Vinegar, Baking Powder (Sodium Acid Pyrophosphate, Sodium Bicarbonate, Corn Starch, Monocalcium Phosphate).