I've only used 15lb and I've never managed to break it yet, it's a decent line tbh, tough, reliable, sinks well, doesn't stretch loads and will last a long time, I change mine yearly, occasionally strip a couple of rod lengths off, but unless you really need to cast to the moon its perfect
15lb Gardner hydrotuff is about the equivalent of most 18lb lines, its bulletproof, I recently tried another line after 1 trip I missed it and it is back on my new reels, unless you are casting miles hydrotuff is a great line
Any Gardner line is better than any fox line, and that is a true fact 😂, 👍