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Cool project—building your own adjustable power supply is a great way to learn and get flexibility for your electronics work.

Between the two options, both are solid choices, but they serve slightly different purposes depending on your specific requirements:

• MP2307DN-LF-Z is simpler and quite popular for DIY adjustable buck converters. It’s a good all-around chip, especially for lower-current applications (up to about 3A), and it’s widely available with plenty of example circuits online. Great for powering Arduinos, sensors, and small loads.
• RT8223MGQW is a dual-phase synchronous step-down controller and generally more complex. It's designed more for high-performance applications, especially where you might want to regulate two different voltages or have tighter voltage control. It's probably overkill for most basic hobby electronics unless you're doing something more advanced or power-hungry.

So if you're aiming for ease of use, compactness, and just need a reliable adjustable supply for microcontrollers, sensors, etc., I’d say the MP2307 is likely the better fit. But if you're experimenting with more complex regulation or multi-rail output, the RT8223 could be a fun challenge.