Personally, I think the second one, because if it were changed to the 3rd person pronoun, you would say "than him/her", not "than he/she", wouldn't you?
I think if you use "I/you/she/he/they" as first person, then you'll have to add to it, like "than I do" or "than I am".
Example:
She's better in math than I am; or
She's better in math than me
Serious English grammar experts only, please.
Thanks.
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