Better in every way. More stable, faster and more in control. Yes, you are 15 mm higher on a 29er and that has implications at low speed. But the higher rotating mass is great at higher speeds.
In the beginning we all had 26, then (finally) someone came up with 29ers and that was THE solution. For a reason I never really understood, 27.5 were introduced seven or 10 years after 29ers, but they were moribond from the beginning and today there is simply not a single discipline where 27.5 win races. 29ers are the right choice; companies like Canyon don’t even offer 27.5 for frame sizes M or higher.
(Yes, I also do own a 27.5 and I know what I am talking about.)