I want corruption-themed abilities. I think part of why I always go for holy stuff is because there's a load of holy powers, even having a whole class.
What corruption powers do we have? Vitality Reap mentions corruption in the description, blight orb is "tainted magic," Sword Soul is the Corrupted Dawnsword's ability, the Girthy Rod has Groping Tentacles (which I don't think I've ever even thought was worth using). If you want to stretch to include any blight ability we can use, Toxic Shock and Vile Miasma are stealable and deal blight damage, though they're more poison themed than corruption/taint, Withering Bolt is the basic black mage at-will which is just raw magic, Reaping Blade is stealable, but it's "a vampiric weapon strike,"
Meanwhile, when it comes to holy abilities, ignoring the supportive stuff like healing and shielding and focusing solely on the abilities that can deal holy damage, we have Aura of Vigor, Celestial Form, Charge Weapon, Celestial Smite, Dawnbreak (with the Crown of Winter), Jade Flame, Sanctify, White Fire, Holy Shock, and Smite Evil, none of those are flavored in a way where you can go "That isn't really divine/good, just holy as a closest fit."
It just feels like there's a lot of options if you want to play a holy character, from a healing cleric to a priest delivering holy judgement to a paladin smiting enemies with holy strikes, you can basically have a full kit of holiness. Meanwhile corruption is just a cloud of life-drain, a floating sword, a single tentacle ability, maybe a tainted sphere, and things that feel more like they're blight just because they don't have a dedicated damage type for plain magic damage or poison damage. And many of those are stealable-only, while holy abilities are often trained or tome-given.