I don't think I would spend much too much time worrying about the digital outputs on mixing consoles. Instead I think it's best to concentrate on having in the gear bag what is needed in terms of cables and connectors to take an analog patch.
Most digital soundboards with digital outputs have to have those outputs "assigned" by the FOH engineer to even work, just like the analog outputs. The soundman may have his own laptop plugged into them, but if not they are the last thing on his mind.
If the levels are too low from the digital outputs on the sbd you have to either live with it or interrupt the soundman to ask for him to turn his attention to the output level of the digital out.
That interchange does not often go well, unless you personally know the guy. Taking analog outs allows you to set your own levels, something you almost always will want to control.
If you still want to be prepared, you will need an XLR to RCA digital cable made to convert the 110ohm signal to 75ohm, which are not uncommon. The example in the attached photos is a TAF3 to RCA I built for my buddy Matt (Nakguy) for his DR-680.
Notice the small resistor that bridges two of the pins so the device will "see" the correct impedence. Having a cable like that will allow you to take AES/EBU down to spdif so you can use the input on your Tascam no problem.
Good luck !!!