I've spent ~40 hours the last 2-3 months trying everything and choosing a CMS I'd use for the next couple of years.

I've been developing with WordPress for ~5 years - users like it, WP Core is shit, you have to work against the clutter it includes by default. The end product depends on your skills. I always developed a custom built theme with MVC (Typerocket), Twig, etc.

Grav is great. Sometimes it can be limiting, but for really simple sites it's great. Also features Twig templates.

Twill is amazing. It is what I use now. It's a Laravel package, meaning that you have to know Laravel (you actually code Laravel, Twill is just a layer of control above it).

Craft CMS is also good, it's a solid foundation, but it's built on Yii, so you have a full-blown MVC (just like with Twill - Laravel). I almost settled with this one, unfortunately it's not free for commercial use.