Now that I think of it, I'd choose to be immortal. I don't have any bonds with people that are so strong that it'd just
kill me if they died. And, anyway, I treasure my own company

.
But, most important of all, I don't believe in the existence of, well,
existence after death--an afterlife. So, yeah, from my perspective, immortality
is all it's cracked up to be. If I have to choose between living forever--even if its a depressing, sad life--I'll choose that next to non-existence any day of the week.
Following is an afterlife rant, for those interested:
Plus, if there IS an afterlife I don't want to go to it. First off, I don't want to spend eternity with the drunken uncle I hardly knew. Second off, short of being drugged/bereft of true free will/made into programmed robots, I don't see how we humans can attain peace and happiness for infinity if we can't do it here on earth for 2 years. Heck--the afterlife's just too hokey for me. It's just another man-made fable--story--a Sugarcandy Mountain.
I mean, I'd get bored with centuries and centuries of happiness and "all our dreams are true". I mean, that's great, but where do you go from there? It's lonely at the top. I'd get bored with it. I'd probably kill myself and suffer a second death! Ha! I mean, if the afterlife were a book, I wouldn't want to read it. Nothing interesting would happen. No plot. One-dimensional characters. And most importantly, no books or Internet. Boooring