Cataract development is much more likely than glaucoma with prolonged systemic corticosteroid treatment, though the latter is a possibility. I've only seen glaucoma from systemic treatment once, but I've seen cataracts numerous times. Now, with long-term topical/intravitreal corticosteroids, glaucoma (or at least ocular hypertension) risk is around 20%, whereas, some degree of cataract development is practically inevitable.