If I'm cloud chasing with a dripper, I use a mech. Its never something I really take out of the house though, just there if I want something that hits hard. For tanks and such, I'll take a regulated all day long. You'll never see me using a clearomizer or kayfun on a mechanical, even though I admire the simplicity and durability of them. For tanks, I'll take my P3 over a mech all day long even though it's limited to 20 watts.
I did leave out my Reo though. My Reo is an unregulated mech, and if you haven't heard of them, you need to have heard of them. They use a traditional rebuildable dripping atomizer that has a hole drilled in the 510 that allows you to feed juice up through the bottom. Inside the Reo is a juice bottle and a straw, and when the bottle is squeezed, juice shoots up into the dripper and your good to go. No extra bottles or messing with dripping through the top. My Reo is my most faithful device and has never failed me. No chips that can fail in it or wires to break or pop. So for me, if I'm using a mech regularly, its my Reo. If not, it's my Provari. I own a Cana DNA30, E-LVT, Templar mechanical mod and none of them see use. Either too big, heavy or in the case of the templar, the locking ring doesn't stay locked while pocketed.