cherrybim
“All American heimish hechsheirim depend and rely on the OU hechsheirim for their products.
Therefore, I would only rely on the non-heimish hechsheirim, ”
That logic doesnt follow at all.
different mashgiichim are different as freddy pointed out
But more importantly different products have different standards for example
Due to potato chips have to be bishul yisroel? The OU says no others say yes. All agree that the food coloring/preservatives contained therein are not oleh al shulchan melachim and do not require bishul yisreoel.
so although a Heimish hashgacha will accept the OU’s food coloring and allow it to be incorporated into their product that doesnt automatically mean the finished product is acceptable to all