As the main purpuse you use, you should prefer a larger screen.The main difference among them is the size of screen. Lenovo A2109 has a larger screen than the others. So I give you a recommendation of Lenovo A2109.
Just for the beginning, you can fully drain and charge. Then to prolong your battery life. You can charge it while the power left between 20%~80%. Don't charge it while the battery die.