John, I can't name all the lines that are the same but have different labels but the classic one is one of your favourites, Maxima. Drennan Specimen is Maxima - but look at the difference in price! There will be several other labels too, that are Maxima at heart.
Don't go by colour when comparing lines. That's just a dye, and a clear line has no dye at all.
What is interesting is that two different batches of the same line can often be remarkably different, hence my comment above that we may be victims of bad batches when we have problems with a line that most others seem to get on with.
The moral is: don't always assume that a brand of line is bad when you know that many other anglers like it (you could have got hold of a bad batch or one that has been stored for too long or in sunlight). And remember that although there are hundreds of different (apparently) brands of line on the market there are only a handful of line manufacturers in the world.
Always buy line from a busy tackle shop (never pet shops/tackle shops and the like)where the line stocks are being turned over regularly and therefore sold fresh.
Beware of buying line where a shop is selling it off at extremely cheap prices as a 'special offer'. It could be line they've had in for a very long time that they were unable to sell at a realistic price.
Don't buy line that isn't in a container, and don't buy line that is in a clear container and been stored where sunlight can get at it.
Unless you really feel the need to experiment with a different line than your usual one, use line that you are personally happy with through experience. That's always the best one because that one comes bundled with confidence, an essential ingredient in fishing.