For trolling i use Momoi on my lighter outfits 8-15kg ( cheap when you buy it in bulk ) and stren for the heavy stuff . I have heard tiagra is good and to be honest i'm sure most lines sold from a reputable tackle shop will hold up ok .
I think if you check it often and replace every couple of years (depending how much use it gets ) all will be good .
Just match the line class to the rod your using and make sure drags are set properly . Since learning this i can't recall busting off a fish due to line failure and have caught fish 10 to 1 (bar some blue marlin that had way too much line out and busted off due to water pressure in the early attempts

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I fish with tiagra 16s on light tackle and they hold over 1000m of 8kg momoi , so every season or so i strip about 600 off and retie new with new (just to save money) . If i ever lose more line than that the knot will be the least of my worries

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Hope this helps .... Craig