Should I get TI-nspire?

I'm doing unit 1&2 meth next year and am not sure on whether I should get a TI-nspire. I already got a casio fx because my brother happened to do methods too like 4 years ago., but I heard TI-nspire is much better. I also go to tutoring for Edatlas and they seem to have this thing called a UDF, but it's TI-nspire only.

I plan to cook (in) meth and aim to achieve raw 45+ study score, but I'm worried that the TI-nspire may make things much easier and I'm missing out.

Is it worth spending a third of a thousand on a TI, or should I just keep my head down and settle with the casio?

If so, are there any explicit benefits of a TI-nspire over a casio?