Sensitive line isn't really a concern with tipups, I use cheap 20# braid, with a couple feet of 6# berkley flouro leader, or a 50# floro quickstrike. The one advantage I could see with a mono or flouro would be the line not freezing up after pulling a fish in, but imagine the cats @$$ you could end up with have after piling 100' of flouro on the ice while pulling in a toad from the depths!