As far as I really don't like touchwiz, I'll admit that Samsung has really stepped up with the N4. The droid turbo is also an amazing phone (at least on specs, not a fan of the design), but I believe the N4 would win in quality and probably be on par in performance (given you erase the bloatware and change the launcher)
Either way both are exceptional "you can't go wrong" phones, so the decision should be based on needs (or aesthetics, if that's a deciding factor for you). The note 4 is a great productivity tool with lots of features, the turbo (at least in sheet, people posting battery percentages at day one need to wait. Bit for the battery to settle) should withstand really heavy use all day, maybe two of light-moderate use
PS: I actually think I would go for the nexus 6, but that's probably because I always wanted to have a nexus lol.
Galaxy S2 ---> Moto Razr Maxx ---> Moto X (2013)---> Moto X (2013)
iPad mini retina