I own both a 2017 Volt
I own both a 2017 Volt Premiere and just bought my wife a new 2018 Clarity Touring a few weeks ago. I actually love both cars for different reasons. Here's a few things that i like/dislike about both:
1. The Clarity gets amazing gas mileage. I just can't believe it and will need to do some more tests to confirm this. I drove from NJ to DC and averaged 58mpg on the way down (this is resetting the trip meter and then hitting HV mode). I got 54mpg on the way back. All going about 70mph. i'm just blown away by this. My Volt would average about 47 on the same trip.
2. Electric range goes to Volt but it's close due to Clarity somewhat smaller battery. i can get 65 electric miles in my Volt. Same trip in clarity would be about 57. This is driving on 45-50mph roads in about 60 degree temps.
3. Clarity drives like a heavier car, is quieter and handles the road very well. Not a sports car but good for my needs
4. Volt seems faster off the line. I don't gun it much so not a big deal to me
5. Volt has an annoying dead foot rest for the left foot. Drives me crazy on long trips.
6. The cupholder on the Clarity won't hold Wawa cups very well. A 12oz cup will have lid knocked off due to hitting the storage box on the way down. A small redesign by flipping the spring-driven plastic piece to the other side would have solved this issue.
7. Clarity charges twice as fast. Both have liquid cooling (i won't buy an electric car without it)
8. ACC on Clarity is smoother. The Volt accelerates / decelerates to aggressively in my opinion
9. Trunk storage in Clarity is huge. Volt does have some advantage due to the hatch though as large boxes would fit easier.
10. You get more detail in the Volt about MPGE, electric used in KWH, gas and electirc usage without resetting trip odometer, etc. The Volt has more detail in this area if that's important to you. I look at it all the time so it's important to me...
if i had to keep 1 car it would be tough. i would probably pick the Clarity but it's still too early to tell.