FLYINHAWAIIAN
Vegan For a Reason
By herbs I presume you meant dried herbs as opposed to fresh.
The main difference is the sodium content. Each of these seasoning contain salt so as a collective, your dish can be very salty.
Dried herbs are not as pungent as fresh as they don't contain the natural oils, drying them changes the flavour of leafy herbs. Dried thyme tastes nothing like fresh.
If your going to have any dried seasonings go for woody spices like all spice, cloves, cardamom or nutmeg. These spices are best bought whole and toasted and grround yourself, pre ground spices spoil quicker.
TBH your better off buying the pure seasoning, garlic powder,onion powder and make your own blend. Then the flavour will be on point every time.
Also, powered herbs go better with stews and soups. Only time i use fresh is in Pho/Noodle soups and other shyt like pasta dishes or roasted vegetables