Well, what would you personally do? Would you put the two utrics together into a same pot if you wanted both to survive?
how much room do you have? both would be perfectly happy in 4 inch pots, heck livida would be fine in a 2 if yah kept an eye on it and divided regularaly. dont know if i would cramp sandersonii that much as it likes to run a bit. if i had to pick on over the other, i prefer sandersonii though