It's funny. Circa 1990 I think calculator enthusiasts were much more likely to be into HP, particularly devices like

https://en.wikipedia.org/wiki/HP_48_series

but TI really took over most of the market and has most of the enthusiast interest. I have an HP Prime but I think I'm the only one, it's a really nice calculator but the algebraic mode is better than the RPN mode which makes not feel very 'HP' and at the core it is another ARM device.