<p>“He is smarter than I” is a shorthand version of saying “He is smarter than I (am smart).” Similarly, “He is smarter than you (are smart)” or “she (is smart).” You wouldn’t ever say “He is smarter than me (am smart)” or “her (is).” Same for as…as constructions. You want the subjective case.</p>
<p>Oh sorry, I should have clarified. Both the examples in your post require subjective case, but silverturtle is right in that you can use the objective case (her/him/them/us) with certain verbs to convey different meanings. Notice in silverturtle’s post that his last two sentences have different meanings depending on what case was used:</p>
<ul>
<li>I want her more than him. -> I want Jane more than John. (I’m choosing between the two)</li>
<li>I want her more than he. -> I want Jane more than John does. (both John and I want Jane)</li>
</ul>
<p>ok so when you’re comparing the first subject with the second (if it comes immediately after like/as) u always want the subjective case… unless you have multiple objects</p>