I am currently using Ernie Ball not even slinky strings because I frequently go into open tunings to play music such as System Of A Down and Bullet For My Valentine I also use drop D to play Avenged Sevenfold.
I have been considering getting some Ernie Ball Skinny Top Heavy Bottom strings for de-tuning and playing lead.
Also are there any benefits of getting coated titanium strings or any other strings other that nickel wound?

What would you recommend?