I'd probably wait for a while before even thinking about buying COIN, because most IPOs trade at inflated prices for days, weeks, or months before the hype factor wears off and investors start looking at the stock rationally, e.g., looking at the company's earnings, dividend, and all that stuff. And my guess is that you'd probably do a lot better buying bitcoin (or some solid altcoins like ETH) than COIN right now, because I don't think the crypto bull market is even close to being over.
TL;DR: Coinbase stock is probably overvalued right now, and buying bitcoin/crypto is likely going to be more profitable in the short-term.