[Haldin Darconis]

Trade paperback > paperback > hardcover

I like the slightly larger size of trade paperbacks. Plus, such as with the Dark Tower series, they contain "bonus material" lacking in the normal paperbacks. (At least, I think the regular paperbacks didn't have the fancy artwork...).

Hardcovers are just too bulky and awkward for the most part. However, they're not back if the book is less than 300 pages and the hardcover isn't extra-large or anything.