Well, in that case it's probably a better idea to go fully Apple. Chances are that your other devices would work more easily in collaboration with it - though you'er going to have to also become an iTunes junkie . Cost-wise it's up to you: if you deem the ease of use between the devices is worth the extra cost for similar equipment, then cost is not to come into the equation.
Thus the only thing you need to ask yourself and try to find out: Software? Is it available or at least acceptable similar clone? Will it work with the files I already have? Will it work with others I have to collaborate with? This goes for all the software you use: word processor, spreadsheet, database, email, web, graphics (raster & vector), games (if any), and other specialist stuff like accounting packages as an example.
This last question is why I cannot get rid of Windows completely.
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