As a fresh grad with little cashflow, and only able to invest ~$1k/mth, would you advise putting them in a diversified stock portfolio, or in a REIT portfolio?

ETFs. I would propose you build up a satelite portfolio with broad-based ETFs tracking either the S&P500 index or any other world index. Keep on learning along the way & when you're confident and comfortable, you can try out stock picking or not it is perfectly fine to stick with ETFs. Theres still lots to explore (ie. Thematic, Sector-specific ETFs...)

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For REITs, maybe youll want to keep that on hold till your ~30s. Focus on capital gain when you're younger and when time is in your favour (power of compounding), dividends can wait.

Looking at SP500 or tesla