Palantir and BigBear.ai have gone in opposite directions since their market debuts. Palantir, which opened at $10 on its first day, now trades at nearly $120. BigBear.ai, which opened at $9.84 after its SPAC merger, now trades at about $9. Let's see why the bigger AI company outperformed the underdog, and if it's still the better investment now.

If you have been following the artificial intelligence (AI) revolution over the past two years, chances are you're familiar with a software company called Palantir Technologies (NASDAQ: PLTR). Since last January,

Related: Walmart, Booking.com will rock markets in a busy earnings week But there was probably more behind the selling, including that Palantir's shares had become way too pricey and were vulnerable to a selloff.

Palantir (NASDAQ: PLTR) stock is getting hit with another day of substantial sell-offs in Thursday's trading. The company's share price was down 6.8% as of 2:20 p.m. ET amid the backdrop of a 0.7% pullback for the S&P 500 and the Nasdaq Composite indexes.