SFR or a duplex offers very predictable returns and has the best financing options available. 

While there's no shortage of options out there,as you mentioned, such as PropStream, DealCheck, REI Simpli, and Podio, the aim is to stand out by honing in on what really matters to investors: ROI, value, performance, efficiency, and possibly price.Expanding on what matters as outlined earlier, here are my assumptions regarding what investors might require if I were to launch a product today:User-Friendly Experience: A platform that feels like second nature to real estate investors, with intuitive design and features that make life easier.All-in-One Solutions: A toolbox stacked with everything necessary for successful investing—from finding leads to analyzing deals and managing properties.Seamless Integration: Make workflow smoother by seamlessly connecting with other essential tools and platforms you rely on.Insightful Analytics: Next-level decision-making with advanced analytics and data visualization that help you optimize investment strategies.Now, the challenge lies in the fact that every investor is unique, and the features might be excessive if they don't offer genuine value.

If you are starting out investing and are just looking to hedge against inflation, this is a great option.

You can get into it with relatively low money down depending on what options lenders offer in your area. 

Just a thought, is an equity loan or equity line of credit an option on either of these?

What options do I have?

Condos can be a good option for new investors, but updating kitchens and bathrooms might not add as much value compared to single-family homes, especially with potential restrictions from condo associations.

I'm researching STR options for my first investment, and I'm wondering what areas of California are prosperous for Airbnbs.

This gives you the best heads up when going through options!

If you want to attract high-income earners who are used to a certain quality of life and can't afford to buy in those areas, then look at your available options; house-hack, partner, buy a condo/townhouse as opposed to a single-family home, start with medium-income earners, etc.