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On paper, both wheels have a direct drive mechanism, which is considered a major step up from indirect drives. The Moza R21 has an advantage over the R16 with its higher torque rating of 21Nm compared to 16Nm. However, in terms of compatibility and quick release type, they are identical.
I've seen multiple users report issues with the Moza R16 wheelbase, including faulty wireless transmitters, notching problems when powering down, and a general lack of reliability. Some have even reported having to deal with lengthy email exchanges trying to get their wheels fixed or replaced. One user had to replace the PCB after experiencing random freezing and uncontrolled steering. Dealing with these issues can be incredibly frustrating and time-consuming. In contrast, users report fewer problems with the R21 wheelbase. However, there are still some complaints about notching when powering down, but most users find it smooth during use. A few users mention experiencing issues with the base feeling notchy without a steering wheel attached, which is somewhat understandable given its design. There have been reports of faulty units, but they seem less common compared to the R16. The Moza brand has faced criticism for inconsistent quality control across their product lines. Users are generally wary of purchasing from them due to these reliability concerns.
Given the technical specs and user experiences, I would recommend the Moza R21 wheelbase over the R16 in terms of raw performance and build quality. While it's not entirely flawless, it seems less prone to the issues plaguing the R16. If you're looking for a budget-friendly option and don't mind dealing with potential quirks, the R16 might still be worth considering. However, if you value reliability and are willing to pay a premium price point, I'd say go with the Moza R21. It's not without its issues, but it seems like a more solid choice overall.