I CAN, and do, read on my Samsung Galaxy S5 but when it came time to replace my 1st gen Kindle Fire, I selected a very generic 10 inch Lenovo Android Tablet.
I've found the two column display on the Kindle app and the Moon reader + pro readers, when held in landscape mode, generate two columns that are each roughly equivalent in size to my 7 inch Kindle fire. I find this a most satisfying way to read.
In spite of the extra weight of the 10 inch device, it was really designed to be held in landscape mode and when done so, the extra weight is not noticeable to me.
But then again, I am a huge, powerful man who eats live bunny rabbits for breakfast.