Both were superb installments of each series and delivered when Nintendo needed them most.
MO was the 3D Mario experience we had been pining for some time. Loved the QoL improvements and surprisingly deep content. It looked great (some levels more than others) and ran great. It was however marred by sub par boss fights. Each one was a dreaded chore.
BOTW was a Breath of fresh air for the series. Probably the most fun I have ever had in an open world game. I spent so much time exploring the world, because I could, with very few limitations. My favorite part was how in the beginning even a simple river was an impassable object. Not due to a blocking layer but simply the force of the river vs your current stats. Then there was the layering of the complex "elemental" systems (fire, water, magnetism, electricity) which made for some awesome times. The art style was perfect for teh platform and allowed for length draw distances. Would also say boss battles here were weak too. Also didnt like any of the "dungeons". They were more annoying than entertaining. But since they were no more than a dozen hours of my few hundred hours experience.
Voting BOTW