A chashuve Rov once told a friend of mine that a car is to get you from Point A to Point B.
– You can hold by a basic, acceptable level of kashrus, and you have a solid, dependable car.
— You can hold by a strong level of kashrus, like the community Vaad, and you have a really good car.
— Some are exceptional and want only the highest quality. They want the Lexus (in this Rav’s terms). There is no reason to look down on someone driving a Ford or an Infinity. But there is something special about a Lexus.
As for what is basic and what is exceptional, that’s for you and your Rav to define. Personally, knowing many rabbanim at leading kashrus organizations, having seen in person, the operational expertise of these organizations, and speaking my rabbanim, I prefer centralized community kashrus organizations for suburban communities, and national organizations for industrial products.
In local communities, the mashgichim visit very often, know the owners, the suppliers etc. When in cities or dealing with industrial food, I prefer the major national hashgachas. They have a level of professionalism and knowledge that is unmatched. If you want to add an extra chumra or standard above them, get products with both the major national names and the heimishe names. This way you know the technical details were covered by those that truly understand the science and machinery, and the extra standards were added by the heimishe team.
But to quote Rav Nebenshal who once saw a pizza store in Yerushalayim with a Bdatz but not a Rabbanut (which is illegal), it may be mehadrin, but there’s no telling if it’s kosher.