Unless you are getting your lr
directly from a lfs
there is going to be die-off either way. IMO
from most online sites generally has more life on it and cured lr
has less and both will have die-off since it's out of water during shipping but uncured will have a little more.
It comes down to how much life you want and how much die-off you want to deal with. Since your tank is still cycling I'd just go with the uncured lr
online or cured if buying from a lfs
Even with the uncured lr
it would only prolong your cycle by a couple of weeks at the most.