advantages and disadvantages of having both system and Liblouis braille tables on Ipad

Hey guys! So, I have a question for you. I've been wondering whether I should have the unified english braille system and the Liblouis unified inglish braille tables on my Ipad. Are there any advantages and disadvantages? Circumstances where one would better over the other? One main reason I'd be doing it, is for learning the new UEB math standard. Another is, for the possibility to have 8-dot contracted braille. Because every time I read a book or magazine in BARD, I need to switch to 8-dot braille for things to translate and come up correctly. And sometimes, I need to leave BARD and say check and respond to a message for instance. And I have an activity set up to automatically switch from contracted to 8-dot braille. But, when I have to leave BARD, it's still in 8-dot braille. Thanks, every one, and happy Holidays! :-)