I would choose a laptop over an iPad, especially if you're going to be doing online trading, etc., which might involve spending a lot of time in front of a (small) screen. At the very least, a Surface with a keyboard that isn't just touch screen.
We love our iPads for traveling, but they will never replace our laptops in terms of ease of use vis-a-vis the keyboard and size of screen. I am constantly having to enlarge the screen on the ipad in order to click on things, as the clickable buttons are so small and I am constantly "fat-fingering" them. The keyboard on the iPad is very small, and no, I haven't gotten used to it in two years. For everyday use--paying bills, esp.--I find a laptop much easier to work with and type on.
We don't use Macs, but I have heard that they are more secure than Windows because most hackers don't bother with them, as Windows gives them more return for their effort. That could be old info, however.
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