I prefer 6 point sockets, 95% of my sockets at work are 6 point, because I am dealing with fasteners that may or may not be new or old. I use alot of 12pt on my vehicles at home though. When I was into hydraulic systems, the largest 12pt socket I used was a 1" SK. These were 12pt bolts on a Liebherr cylinder piston. Im sure it was actually a metric size but it is all I or the shop had that would fit. I would not get that bolt to move with heat, swepco 808, or candle wax... until I got the IR 1" drive impact out, with reducers down to 1/2" drive on a chrome socket, not a good idea, but its all we had at the very moment. Luckily this was at the end of the day. I got about half way through and the socket split, I didnt warranty that one, I bought a new chrome socket and I ordered a 12 point Proto impact socket from McMaster Carr, was there the next morning, took the fasteners off no problem. Sometimes, you just need that perfect tool... As far a wrenches, I like 12 point just for flexibility. Ill tighten a fastener with a wrench if I have to, but I always try to use a socket.