Either of those cases is fine. The Meshify C has better airflow. For any high TDP system that where cooling might be a consideration, you probably want to shy away from models with restrictive front panels where air is only able to get in through a restricted slot or hole. Full panel mesh, like the Meshify C has, or a plan that involves a specific case but modification of the front panel or purchasing an addition pre-modified front panel, is usually a good idea.
It can work either way, but full mesh or at least partially open front panels just work a lot better. This bears out in thermal testing. Yes, they tend to be a LITTLE bit louder, because the fans are directly open to the outside with nothing really to block the noise, but the cooling performance is generally significantly better.
You definitely don't need a full tower. Mid tower is exactly what you want.
Both those cases only come with two fans, so you are going to want to add some fans as well.
Personally, by the time you add on another 40 bucks for a decent pair of fans, you could get a really decent case at around 140 bucks, that comes with three fans, and then only add another fan (second exhaust) if it needs it, which it probably will, but you could do it later if you wanted.
Are you specifically targeting white cases? Sort of looks that way. I'd look at this case, which is exceptional in just about every way considering the price.
https://www.newegg.com/white-fractal-design-define-r6-atx-mid-tower/p/N82E16811352082
But that Meshify C would be fine. I think you'll have to add some fans though.
Probably have to add at least one fan no matter which way you go.