On foods being "healthy". It's really down to your biology, age etc but most of all your overall diet.
I'm not personally a fan of pizza (a lot of fat and carbs) but if you're going to eat pizza, look at quantity (it's easy to overeat) and what you have with it.
I think this is the pizza you're having:
Tesco Stonebaked Vegetable Pizza 380g - Tesco Groceries
So the portion size is half a pizza. If you're having it all, that will be too many calories for most women. If you still want to have it, also eat half a plate of vegetables with it. E.g. salad without dressing or cooked green veg.
I'm not sure which cheese and onion quiche you mean, I can't find a healthy one online but if it's this one:
Tesco Cheddar & Onion Quiche 160G - Tesco Groceries
It's pretty high in fat.
An alternative might be to cook yourself a frittata (which are pretty easy to do) and then you'd miss off the pastry. It still wouldn't be low calorie but lower. I'm not as much of a stickler on "ultra processed foods" as some here and I've worked in pizza and quiche factories. The ingredients are pretty basic and no different to what you'd use at home. But by cooking yourself you can make changes, e.g. add vegetables in, cook without the pastry etc.
But centring both of your liked meals about both these foods it's worth pointing out both are quite carb heavy as well as fatty even if you only have the suggested portion. I will defend the food industry most of the time as a lot of the criticism is unjustified BUT they will design food to a calorie count which looks good and not assess that the portion you are suggested to eat in any way fills you up. This is my problem in a way with calorie counting as people can obsess about the number then wonder why they still feel hungry when what they ate was not satiating. It's also fair to point out both will be low on fibre.
If you prioritise protein and fibre, you are more likely to feel full. An alternative could be some cooked chicken in a marinade or fish, this would be higher in protein (and fill you up) and lower fat and carbs. If you then fill your plate with green vegetables, that introduces healthy carbs which take longer to reach your blood stream and fibre you will be so full you might not reach for the ice cream.