i have been buying zoff kesarco and tata for more than a year they do taste somewhat different from other brands especially tata and kesarco are very good.
personally i prefer these 3 brands first then aashirvad and at last reliance have never bought mdh everest
if large quantities are ever needed then offline mandi"s
i usually buy whole spice packs like
https://www.desidime.com/deals/paytm-zoff-pack-...
etc.
Buy whole spices and ground them yourself, you will save one layer of processing.