Malygos is a complete wildcard, you can play a gimmick shaman with it, but it's a very slow deck that isn't all that fun to play imo. Personal preference though.
Tirion Fordring is the one of the best legendaries in the game, just depends on how much paladin you play.
Alexstrasza really only works in control warrior and freeze mage, but those are pretty expensive decks that you may not have completed.
Harrison Jones is somewhat versatile (control warrior, various priests, various paladins, various druids, and more according to the meta), but isn't really a fun legendary to have imo. It's pretty effective though.
I have enough dust for a legendary what should i craft?
Malygos is a complete wildcard, you can play a gimmick shaman with it, but it's a very slow deck that isn't all that fun to play imo. Personal preference though.
Tirion Fordring is the one of the best legendaries in the game, just depends on how much paladin you play.
Alexstrasza really only works in control warrior and freeze mage, but those are pretty expensive decks that you may not have completed.
Harrison Jones is somewhat versatile (control warrior, various priests, various paladins, various druids, and more according to the meta), but isn't really a fun legendary to have imo. It's pretty effective though.
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Tirion is absolutely amazing in Paladin.
Alex is great in control decks, but needed in Freeze Mage and Control Warrior.
Malygos is mostly gimmicky but has some decent decks available, and you can't replace Malygos with anything.
Harrison is a great card, but tech. He can be replaced.
All things considered, I'd go with Tirion if you play a lot of Paladin, and Alex is Freeze Mage/Control Warrior is more your thing.