With the polling mistake in the other thread, thought I'd redo the topic correctly. My favorite hilts are currently Anakin's lightsaber from ROTS, and Obi-Wan's lightsaber from TPM. Both are very nice, well-done hilts, and have a unique and interesting design to them.
I like Mace's saber the best out of the film lightsabers. Sleek and nice design. Obi Wan always has nice sabers too. Tenel Ka's rancor tooth saber, Tyvokka's curved wooden handled blade, and Gungi's lightsaber are nice too.
I can't pick a favourite, they've all got their signature look. That said it must have been a very difficult moment for Ewan McGregor when he got to choose his out of a box of Lightsaber hilts during the production of TPM.
Liam Neeson, Sam Jackson and Nick Gillard got to choose theirs as well (and keep them after the films were over). There is no record of Hayden, but I'm sure they offered his hilt as well. They did it to Christopher Lee too.