Sorry, can't do it. I have many different tastes depending on my mood, but I've been compiling them here: http://www.mangago.me/home/mangalist/902/
The top one on that list, http://www.mangago.me/read-manga/tsumasaki_ni_kourozu/ , has my favourite manga short story: http://www.mangago.me/read-manga/tsumasaki_ni_kourozu/mh/163653/Vol1_Ch5/pg-2/ (A Fish's Warmth).
I can't decide, you just pick one then. Heh~(>‿O)v
http://www.mangago.me/home/mangalist/13704/
http://www.mangago.me/home/mangalist/263/ (the first page of my fav's list are pretty much like my fav)
(here's my favorite list) http://www.mangago.me/home/mangalist/22680/
Confession (Naono Bohra)
Guys, would you please tell me your most favorite manga? Just one is enough.. thanks in advance :D