I treat Press Releases with some sceptiicism as they are almost invariably part of a PR or product advertising campaign. If they are released by the mfr or retailer, they are hardly an impartial source. Similar considerations apply to trade magazines which are not written with the consumer in mind.
Ah, So you now regard SeriousSam's comments as valid? I fully accept that you think that some supermarket brands are 'better' - but as you haven't defined 'better' it is pretty meaningless. You might mean better value for money - ie cheaper for the same taste. You might think better taste - regardless of price (where taste is very subjective).
There certainly have been trials where a panel of consumers in double blind trials have preferred the taste of a supermarket own brandproduct - and those particular products may represent better value for maney - but it doesnt mean that
all own brand products from a given supermarket are better for
all people.
I certainly buy some own brand products when - after trying them - they offer a better (usually in terms of value for money) experience. In practice probably 75% of my weekly shop is supermarket own brand.
So I'm not exactly sure what your point is. Yes - some people may find some supermarket own brand products superior to well known branded products - hardly a revelation, more a statement of the blindingly obvious. But I certainly don't need a press release or a trade magazine to validate or justify my choice.