Either works. The difference is the seriousness of the point being understood. "I noticed" suggests recognition of a minor point.
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habibaelgindyYes, II would use the present tense. This is like "know". I know that. 'realize' is the result of a mental/logical deduction.realizedrealize that.
habibaelgindyYes, I noticed that.'noticed' has to do with perceptions. This is like "saw". I saw that