I guess it depends on what you can get locally. Each of the main large supermarkets in my area of the UK have own brand and at a similar price of £3.50 per litre so I am happy if I can get a bottle for that amount. Each works in the same way for me.
My wife has treated me to better brands when they have been on offer but as I don't taste it and the calories are the same I stick to the own-brand.
Only variance seems to be the quality of the non-drip cap on the bottle, and for a little while how ELOO was labelled. If the main label is slightly different then the description of the product and the colour (if in a clear bottle) confirms that it is processed.