Boy, I don't know where to start.
I think my favorite overall is the B-E 485 shovel.
For graders, the new 14M is nice, but you can't move the blade far. The First Gear Komatsu's are more detailed and moveable.
Haul Trucks, the new 960E Komatsu's are very nice, but I still think my favorite is the 797B Cat from NZG
Loaders, 330E Volvo comes to mind. It has nice details. The big Cats do not quite get it. They look nice, but you can't get the boom all the way up, or the bucket dumped.
Trucks, so far the DHS Pete's are great, but I should be getting my T-800's soon, and I am a KW guy, so it will be the new favorite.
Dozers, the D-10T is very nice, and the larger ones stand out better on the shelf.
Scrapers, from a distance the 657G, but up close, it leaves a lot to be desired. The Letourneau C-Pull looks really good.
Excavators, my favorite is my 375, because it was my first excavator, and I have some of them in 1:1 as well. The 450 Deere/Hitachi is a very nice one as well.
Water equipment, look at the HM 400 Komatsu with the Mega tanker on it. That is a nice rig.
Then there are the cranes
That is enough for a whole new topic, so I will save it.