I used a ti-inspire, doing algbra and calculus in the ti inspire is better. But for probability the classpas is better.
For General maths classpad has some functions not avaliable in ti-inspire not very imp but u might need to do it by hand depending on th question. Again not super imp but just wanted to let you know.
Overall the ti-inspire while being a little less user friendly is more powefull, better processing unit and more ram.
So I would recommend ti-inspire for methods and general.
(also most uni's suggest ti if u need it for ure course) so u might save money in the future.