The iPhone app has all the function of the TI version. The iPhone certainly has a more capable computing system than the TI, and a better looking user interface. Neither one is waterproof, but you can buy waterproof cases for the iThings. If your electrical system
fails completely, you might not be able to charge the iThing, therefore replaceable batteries might be an advantage, although there are external batteries for the iThings. I'm not sure what advantage you think the calculator might have.
The TI plus the Starpath software
would be cheaper to buy than an iThing plus the software
, but if you already have the phone
, I can see no real advantages to the calculator version.
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