Hello, Siernan-- and welcome to English Forums. Please can you say me which is more correct and why? -- All of the below are correct.
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Adverbs that are identical in form with adjectives take inflections following the same spelling and phonetic:
Early-earlier-earliest
Late-later-latest
Slow-slower-slowest
Several adverbs ending in - ly (quickly, loudly) form comparatives to the same pattern, dropping their adverb forming suffix:
quickly - quicker-quickest
Loudly-louder-loudest