I'm a big Mazda fan, and we had a great experience with a 2006 Mazda5 microvan. But I'm even more of a Honda fan, and I've liked the Kias I've driven. So, as I've been laying the groundwork for replacing my 2010 Acura TSX (6MT), I've tested a Mazda 6 Grand Touring, multiple Accord Sports, and a Stinger GT-Line with AWD. Apart from one nice back road romp in an Accord Sport 2.0T (10AT), they were short test drives that didn't involve the highway, but all three were on the same roads, so I'll give my impressions FWIW.
IMO, the best
value is the Mazda. I simply could not believe how much content was available for about $28k out the door. But, given all the accolades it's received as a driver's car, I was slightly underwhelmed. I didn't think the steering was all that special, but of course the tires are a major factor there. I also thought it had a slightly harsh ride. The 6AT isn't the greatest. No question it drives very nicely, much like my TSX, but I wasn't blown away. I liked the interior, which seemed a cut above the Honda.
In most ways, I loved the Accord Sport 2.0T. To my immense surprise, I actually liked the 10-speed automatic. It's very responsive and works well with the engine. And the engine is simply outstanding IMO, definitely the best of the three. Overall, I thought it was a better driver's car than the Mazda, but I would need back-to-back seat time to be sure. It had less tech and luxury than the Mazda for about the same price, and the stereo is really lame, but it's still a great value. The availability of 6MT is a huge plus, but but my left knee (darned thing is 53 years old) tells me it might be time to ditch the third pedal!
My favorite was the Stinger. Even though the engine can't quite match the Honda 2.0T, it's decent, and the transmission is excellent. But for driving, the key is the rear-biased AWD system. In sport mode, when powering out of a corner, it feels close to RWD. The Honda and Mazda simply cannot do this. I also think it has a slightly smoother ride, probably because of 18" wheels instead of 19". (I live in downtown Philly, where a little extra sidewall is darned nice.) With the Sun and Sound package it's very nicely equipped. I also liked its overall feel and character. It's cooler and more interesting than the mainstream cars, yet would still be easy to live with on a daily basis. Downsides? Fuel economy, poor rear visibility, and no Forward Collision Warning (FCW) or AEB (Autonomous Emergency Braking) on the GT-Line. (The last omission is a deal-killer for me, but I bet that will change for 2021.)
When the time comes, I'll go for longer drives including the highway, and maybe there will be a 2G Acura TLX to consider. But for now, I think I'd be happiest with the Stinger.