One of the biggest issues throughout general gameplay is that paladin stuns have a cooldown and cost a good deal more mana whereas a shadowknight can just spam disease cloud (or clinging darkness if so inclined). Flash of light works for aggro in the lower levels, but it doesn't generate as much threat, it just affects who the mob will target for the duration of the spell. This means later on when mobs resist a lot, it'll become less reliable for aggro. So, when a paladin has to rely on mana-heavy stuns, they have to have clarity. If they can't get that, they can't tank without downtime. If they have to pull as well, spending mana on pacify and getting in less medding time, it becomes a problem.
Paladins also do terrible damage. Their utility is better than a shadowknight, but the latter can put out reasonable damage for a tank if they have clarity or mana song. In trivial content where the group just grinds dark blues with no real chance of dying, a shadowknight makes the killing go a little faster. This is usually not enough to make most people specifically pick an SK over a PAL, but it can be a factor.
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