I was reading in the wiki and on the dailies section it's said that some quests are not worth doing. Which ones do you guys do?

All of them...sort of. I'm questing for Morty cards and quest points for the most part so the individual prizes/quests don't matter that much.

I always start with Shinwa - for the boosters. Then wiz for the tokens. Blue Bldg for the points and because there's only 5. Library - for the rare item drops. Pete - for the item drops. His items aren't that valuable most of the time, but he tends to drop newer items. I do the others as the mood strikes me.

I leave maleria and saggi for last, and if I run out time/get bored/get distracted, I don't mind if I don't get around to them. Maleria used to give a good amount of sP, but they've gutted her recently and if was going to skip a set, I'd skip hers. Unlike most others, I'm also not a fan of saggi.

When I can be bothered, I try to do all quests. If not, I'll usually do the Wizard and Blue Building, though I may avoid those if new items have been released in case they get asked for.

Most quests are useful in their own way. Sarah helps you get SP quickly, Saggitarius will often give more SP than you spend, Quentin can give out amulets which can be sold or used to try and get tomes, and they also give out items that become seemingly useless after a while, but you should hold on to them because the Recycle Beast asks for them sometimes. Pete and Alexander and Carl and Mori/Nori can give out good items sometimes, especially on weekend quests. Cinthia and Maleria usually only reward SP unless they're the weekend quest or there's an event, Cinthia gave out flowers during Vesnali. I'd say Cinthia and Maleria can easily be skipped, though, especially since Maleria can get tedious when she asks you for 3 items and they're all in restocking shops so you have to do the 5 second wait thing.

I always do the shinwa quests and wizard quests.