Should I use -10dBV, +4dBU or low gain for synths? Or a DI box?

Hi Guys,
I've recently purchased an RME UFX audio interface which I'm running with Logic, and I'm not quite clear which setting I should be using for synths that are coming in through the line inputs of the RME.
The options are -10dBV, +4dBU or low gain. I know that there is a preferable setting, however I'm not clear on what it is (or what the different uses for these settings would be).
I recently read in Sound on Sound that even if an interface has line level inputs, it's always a lot better to run synths and keyboards through a DI box. Is this actually what I should be doing? Or do the above setting options mean that I don't need to worry about a DI?
I'd love any advice on this from someone who is clearer on it than I am!
Cheers and thanks,
Mike

Most synths are either switchable for +4 or -10 output. If not, they are usually -10. If the level seems low when the interface is set to +4 then set it to -10. Low gain is probably a hi impedance guitar level input.

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