I replaced the std nut on my G400 with a tusq nut. When I order the neck for my Tele project guitar, it was ordered with a tusq nut. My other guitars is whatever came on them when they were built.I like tusq... and I don't care if someone says it's plastic.
I've used tusq on a number of guitars and and zero problems and
many advantages. Bone might be best, but for me it's tusq.
On the G400 I could hear the difference immediately between the stock plastic nut and the tusq.