The NCV3 chassis (pre-2019) is the better chassis for fewer NHTSA recalls. The VS30 (2019+) has had it's share of problems, same source, NHTSA. My NCV3 chassis has had a total of 3 recalls, and one didn't require corrective action. The other two were minor.
Now, the NCV3 is a very minimally equipped chassis which is why Winnebago chose it (stripped down price), and what MB built into it (the basics). The VS30 chassis that Winnebago upgraded to, has all the bells and whistles you would want, but with more recalls. As for overall performance, either is fine, not much difference in chassis specs.
2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 Wrangler JKU (sold @ ????) - 2016 Sunstar 26HE (sold @ 4600 miles) - 2002 Roadtrek C190P (sold @ 315,000kms)