You people might know this - what’s the difference between supermarket/mothers pride bread and sourdough?
Can’t really put my finger on the taste difference either.
I'm not sure if you're being serious here!
Supermarket bread is industrially processed pap with a list of ingredients as long as your arm; all sorts of additives, preservatives, enhancers and other fakery to prolong that 'soft' feel that is mistaken for freshness. It is generally tasteless.
Check the label on your next shop loaf and see the stuff they put into the humble loaf. The worrying thing though is that if you bought it from an in-store bakery, they're not required to list all these ingredients! This only adds to the con trick that your supposedly getting a freshly made loaf.
From mixing all these ingredients to removing the finished product from the oven can be as little as 45 minutes in total. That's a forced system designed to churn out as much of the product as quickly and cheaply as is possible.
In contrast, sourdough is made with four ingredients; water, flour, salt, time. The fermenting process can be several days or at least overnight. You end up with a bread that has flavour, structure, nutritional value, and is easier to digest. (Some people who have self-diagnosed as having a wheat intolerance have found they can happily eat sourdough.)
The flavour is dependent on a number of factors but typically it will have a sharp or sour tang to it. The degree to which this is present is affected by the type of starter used, how it's fed, how long the fermentation was & so on. Of course, you can chuck in all sorts of ingredients to make a sourdough of your choice rather than sticking with the bare version.
They are, in all respects, at opposite ends of the bread spectrum.