@Sebgo. I know you only asked for opinions on 2021 MC and Nautique 200. But, you should also consider a new Malibu Txi.
I got to drive and ski a 2021 Response Txi recently. It drove as good as any ski boat I have ever driven. Tracking was easy well into super shortline passes, and the power out of the hole was incredible.
I skied a set at 34 mph, and a 2nd set at 32 mph. Both felt great. Super soft and small wakes. I have never skied anything any better.
Quiet, solid, smooth, and fun to drive.
Great looking inside and out. Excellent ergonomics and features.