Soy milk is more common and around where I live, cheaper. I also prefer it because it is less rich, which is a deciding factor in many recipes. I’d say, most common baking and uses use soy, but for a richer taste, like a thick sauce, almond. Congrats on going vegan!
I would have to say almond bc it is less in calories and very high in protein(I buy a brand 35 calories in a cup ,0g of sugar). As far as cooking goes I do not think the taste changes depending on which milk you choose. I do not really eat cereal but if I do I eat it dry or with water. I would recommend buying both and seeing which you prefer.
Btw Starbucks has soy milk and good earth also has vegan milks