Ok...I am about to place an order for a new tank & need some suggestions as to whether i should go with the kanger protank mini 2 v2 or the kanger mini unitank? Someone please help suggest to me which is the better tank because I am really poor & don't have alot of money to be wasting on something that isn't going to be reliable. Thank you for your assistance with this you have no idea how appreciative I am for the help. With which tank will my liquid last the longest & which of the tanks' atomizers/coils will last me the longest?