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It really depends on what you're looking for at breakfast. If you want protein and a decent energy boost, cow's milk wins hands down - it has double the protein compared to almond milk and keeps you fuller until lunch. If you avoid dairy by choice or because of intolerances, almond milk is an alternative that works, even though nutrients like calcium are often added artificially.
Almond milk is lighter and generally lower in calories, so if you're grabbing breakfast on the go without being starving it's totally fine. But if you combine either option with cereal, toast, or other protein-rich foods, the difference shrinks quite a bit. A lot of people use one or the other out of habit or taste rather than for any big scientific reason - if you like the flavor of one, that's already the best choice for you because at least you'll drink it.
If you're unsure, the lazy solution is to switch between them depending on the day or what you have in the fridge. It's not that one is "better" in absolute terms; it's that cow's milk has more concentrated nutrients, while almond milk is easier on digestion for people who have issues or just don't love the taste of regular milk.
If you need something at breakfast that keeps you full until lunch, cow's milk is objectively more effective because it has more protein and fat that create satiety. Almond milk is lighter, almost water with a bit of flavor, so if you just drink that with your coffee in an hour you're hunting for snacks again.
But there's an option that few people consider: mix the two. Get half cow's milk and half almond milk - that way you cut the calories if you want, you still keep the protein, but the coffee's flavor changes less. It's a stupidly simple compromise that works well if you can't decide which one or if one of them bores you on its own.
Last practical detail: if you use almond milk, throw in a fruit that has protein (like some Greek yogurt on top, or a handful of roasted almonds). Almond milk on its own isn't breakfast, it's a side. Cow's milk on the other hand is almost enough on its own.
Personally, almond milk doesn't fill me up at all - after an hour and a half I'm already hungry. But it really depends on how you pair it: if you have almond milk on its own, yeah, it's basically water with some flavor. If you drink it with a solid breakfast - whole grain cereals, toast with peanut butter, whatever - that changes things. The protein comes from the other ingredients, not from the milk.
What I don't agree with from what was said before is that cow's milk is "objectively" better. Sure, it has more protein and fat, but that doesn't mean it's the right choice for everyone. If you have digestion issues, allergies, or you just don't digest lactose well, cow's milk won't make you feel full - it'll make you feel sick. In that case any alternative is better, almond included.
The real question is: what can you stick with consistently without problems? If cow's milk leaves you bloated, it's not "better" - it's worse. If you like almond milk and you pair it well with other protein-rich foods, it works fine. It's not rocket science, it's just finding what your body accepts without complaining.
Almond milk has about a third of the protein compared to cow's milk, so technically the others have a point about satiety. But the real difference is that it depends on how you structure your entire breakfast, not just what you drink.
I personally use almond milk because the other one sits heavy on my stomach, but I don't drink it on its own - I always add cereal, nuts, or a bit of honey to it. That way it actually keeps me full until mid-morning without any issues. If I just have almond milk with a pastry though, yeah, I'm hungry again after an hour. With cow's milk it might work better in that case, that's true. But if you're someone who eats a proper breakfast anyway, almond milk isn't a problem.
The final choice also depends on what your stomach digests better and whether you maybe have any intolerances. And if you're not someone who rushes through breakfast - if you do it properly with other foods, almond milk works great.
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