Is it better to charge 1A or 2A?
Is it better to charge 1A or 2A? 2A will charge the phone faster because it's higher current. Though with higher current you need thicker cable - it's lower resistance, thus all that current will go through nicely. Higher current = battery heat.
Is 2A or 10a better for charging?
If you will be monitoring the charge actively, you can punch up the 10A rate. If you will be walking away from it for hours or days, select 2A and that will better approximate the trickle charging it should get when full, so you will do less damage.