I have an LG G-pad Google Play Edition. I would like a larger tablet but I dislike Samsung's bloatware enough that I'm avoiding their otherwise very desirable Galaxy Tab S. So I carry a thin paper notebook in my back pocket for times when I can't keep up with note-taking using a Bluetooth keyboard with my tablet. Together with the very thin keyboard, it's lighter than any laptop and the battery life means no undignified crawling under clients' conference tables to plug in a power supply.

Samsung makes a 12" tablet with a pen. It's not what I'd want but maybe you should give it a try if written note-taking, equations, and drawing on a tablet is what you want.