I use Thieme because it's what my school uses. One of the authors is the course director, so we get exam questions that will test us on a lot of the little text boxes and clinical vignettes in that textbook. I don't know how it stacks up against other anatomy books, though, as I have a biased experience. I do really like Netter's coloring book, though.
I spent so much time with Netter that I have a biased emotional connection to it.
I recently flipped through the most recent Thieme and it was pretty nice and the added HY text is a bonus. However, the history of the Netter atlas and the fact that he puffed on a cigar and illustrated the whole thing is just amazing. His illustrations are medical history. I use Netter's Ortho a ton now too and it's nice seeing the same style again. Netter all the way.
I like Thieme but I feel like when I'm learning arteries, netters always has ALL the branches and Thieme doesn't show them all. But I need to know all of them. But now anatomy is almost over so I don't feel like switching lol
Everyone in my school used Netter's Atlas, I liked it overall.
I will say, the 3D Atlas's are an amazing tool though.
I might also suggest getting an Atlas with real pictures from cadavers, it gives bit of a better idea of what to look for in the lab. SUNY Downstate anatomy website has some good virtual pics form there lab.
I love the illustrations in Thieme but Netters has more detailed labeling. I use both because of this. Also Rohen's can't be beat for what it's actually supposed to look like. You could pick up a new Thieme and a 3rd edition (or any older one probably) Netters for pretty cheap.