What leaders for fly-fishing pike?

I’ve not done a ton of it, but I’ve used either 100 lb. fluoro or the 30lb. titanium. The Fluoro I generally have fairly long as I’ll re-tie quite a bit – checking for nicks in line after each fish – and with titanium just 12 inbches or so with some fluoro (30 to 50 lb.) between it and fly line.