I've used the Makita 18v last winter. My freind has the 1.5ah and it was very cold out side, which affects the performance of the smalled, lighter batteries. I'm not a fan of this drill, it is lighter for sure, but it seemed to lack the to get it dome with larger screws.
I had the newer 18v DeWalt but it is big, like the entire line of drills. Also the speed variable speed control on my tool was a bit dicey, not alot of control between creeping and all-out. The new drill is compatible with the new LI which would definately take some weight off but it will still be a big drill.
Currently I am using two differant drill platforms. I bought a Hilti combo impact and drill. I think they are 14.4vLI. I like the power these drill provide compared to its size. The batteries are bigger than the Makita but the drill is smaller. I believe that cold weather effects smaller batteries more than the bigger one.
Recently I foung a brand new 12vNiM Panasonic at a pawnshop. I really like the Panasonic platform. This drill is small, powerful and has good weight even though it is a NiM battery. I wish it was a LI. Someone told me that Festool had/has a relationship Panasonic. I was told that Festool made the drill and Panasonic made the batteries.