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Blissfully unaware of mathds for years I have used $\mathbb{Z},\mathbb{Q}$ and so on. No one has complained but is there a best practice on choosing between mathbb and mathds for these?

There has been discussion here of using mathds for 1 and for A. Are there other technical issues I should know about in making my choice?

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    \mathds is presumably defined in some package you haven't stated and gives a double struck alphabet. Like any font choice it is just a style choice. – David Carlisle Feb 9 '15 at 15:08
  • Are you interested in just uppercase letters? – Mico Feb 9 '15 at 15:09
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    dsfont package provides \mathds{..} alphabet. If you want to use that alphabet, but with the usual command, just do \let\mathbb\mathds. – Manuel Feb 9 '15 at 15:11
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It is good to be reminded that from a LaTeX team member's viewpoint font choice is just a style choice. But from a user's viewpoint some choices would be unacceptably odd and others would be not best.

Manuel brings up a technical issue that is decisive for me. Even using the amsmath and amsfonts packages you do not have \mathds. Of course I can easily add the dsfont package but I can't assume everyone I deal with has it, or wants to add packages for me.

While mathbb only handles uppercase letter, mathds add numerals. As far as I can see looking around online, neither handles lowercase letters (which you probably would not want to see doublestruck).

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    I see there is a vote to delete. Is there a problem with the answer? – Colin McLarty Feb 13 '15 at 3:38
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    Regarding the last paragraph of this answer: in the documentation I have for the mathds package (version 1.111, the PDF file says November 29, 2006), besides uppercase letters, \mathds supports the figure 1 and lowercase letters h and k (see page 4). – frougon Jun 21 '18 at 21:12

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