Ultimately it comes down to your own preference. I presume you're getting a warranty because it's a 2019 vehicle. I've heard good things about the 350, but I never owned one.
You're looking at two completely different cars, even though they're both ESs. The V6 may have more moving parts and such, but Scotty tends to say good things about Toyota V6s. It should run circles around the hybrid in terms of speed, and would be considered higher performance than the hybrid. The thing with hybrids is you need to make sure you have a good mechanic that can work on them. If the dealer is doing all the work, that's not an issue. I'm also not a fan of CVTs, but you shouldn't worry about it unless you want to keep the car for longer than it's covered by warranty.