HP Prime or HP 50g

[edryer]

The 50G is the finest mathematical platform on the planet, even with its quirky UI, there are at least four ways to enter matrices/vectors for example (going all the way back I assume to the limited 28 series way of entering them), and for linear algebra it has no equal, with its heritage of libraries 28/48/49 it is superb.

I also use an TI NSpire CX CAS, but always find myself going back to the 50G, the CX is a fine (very underrated in my opinion) platform but the ultimate flexibility of the 50G beats it (and every other handheld) hands down.

The Prime (like the CX) are great educational tools though.

PS. Don't want to get into a 50g/Prime war..... everything imho!