<p>The two are similar only in that they're both extremely selective and prestigious.</p>
<p>To [over]simplify, TASP is the humanities equivalent of MOSP. If you're a math/science person, also look into RSI (Research Science Institute), just about as prestigious as MOSP. However, RSI and MOSP have different foci, with the latter focusing more on mathematical problem solving and the former on scientific, mathematical, and technological research.</p>