Edexcel A-level Maths - Do I need the graphical calculator?Watch
Honestly, I have both and the graphics calculator is much easier and you can draw graphs with them. For me, I prefer graphics, but I know some people who can work with the class-wiz.
I got my graphics and class-wiz supplied by school. Check if your school supplies them. I got my class-wiz for about £18 and graphics for £75.
I hope this was helpful.