Can you guys advice on how to identify good quality monofilament fishing line (except for the obvious price difference)
Hi, It again would boil down to the intended use. For example a reasonable and decent mono is Berkely Big Game. I've used it for years on the Cauvery and it's been a brilliant line, because of it's thickness and abrasion resistance. It's a s**t line to spin with.
If you're casting or spinning in a place relatively free of snags and rocks it would make sense to use a more premium mono, which will aid you in getting more distance on your casts or allow you to use lighter lures.
Makes sense to invest in a couple of spools of different brands of mono and come to your own conclusions.