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A brief calculator history
I have used both TI and Casio calculators through the years (and other brands too). My fist calculator was a Radofin 2560 that my mother gave me when I was thirteen or fourteen. I still have it, but it is broken.
Next I used a TI-30 for a year or so. That was as a loan from my gymnasium. After that I switch to a TI-59 that I used for a couple of years before switching to a Casio FX-502P. Both of these where fantastic devices, but I found myself using the Casio more often. Two reasons, size and battery time. This was somewhere around 1981.
From that I switch to a Casio FX-850P. This was about 1987. I used that one until I bought a Casio ClasPad 300 in 2003(?). I only had it for a week though, because I found the display to be awful, and the calculator not that user friendly (at that time), so I went back to the shop and changed it for a TI-89.
In 2007 (I think it was) I got the first model of the TI Nspire.
I need to do quick calculations nowadays I either use a black TI-82 Stats or a Casio fx-9750. Main reason for the use of those is that we use them at work and they are easier to use than the Nspire, at least for quick calculations.
My collection of calculators
I have a small collection of calculators (about 50 of them). I just picked up my Casio FX-502P from the drawer where I have my collection, turned it on, and its running. I think it was in 1988 I last turned it on.
The oddest might be a Casio BP-2000C that can be programmed in Prolog.
For the FX-850P I built a printer port interface.
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