Personally I would never buy another Samsung tablet or phone again. Samsung's unwillingness to provide proper source and specs, and especially the specs of their proprietary Exynos CPU, along with not updating the OS for older devices, makes them a non-starter. Even as Nougat is rolling out we still don't have a stable Marshmallow release of CM13 for the Note 8 (and will never have either MM or N from Sammy). Personally I am unwilling to spend $400 every 2 or 3 years to have a current OS with current security updates.
If you have money to burn then consider the Google Pixel C. It is a premium tablet (at a premium price) with Marshmallow and a reasonable expectation of future OS support. If you are cheap like me then look at the Nvidia Shield K1 for "only" $200. It is quite powerful (the GPU is huge for games, etc), has a good display, and stereo front-facing speakers.
Greg