Thank you SO MUCH for all the replies!

I'm doing a tutorial on power saving so I wanted to check with people on here before deciding what to say about switching off or standby.

I think on balance I'm going to tell people to leave their tablet switched on, especially as people involved in tablet development seem to be giving out this advice.

I've certainly heard experts say this about smartphones, that they load and run so much setup stuff when they switch on that it's better to leave them on standby, so this may well be true about the tablets as well.