Which manufacturer I prefer is a question I have always asked myself, but never been quite able to answer.
Since I had to chose only one from the list, I went for Boeing.
The reason for this choice is that the 747 is, without doubt, my favorite of all aircraft, and the one that made me fall in love with all the others.
When I was 5 years old, we moved to Canada with my family. It's a far away memory, but I distinctly remember being at the "old" (T1) classic Charles-de-Gaulle terminal, and looking up at the jumbo jet that would fly us away to our new life. It had the old Air Canada livery (which I think is infinitely better than the strange current pale greenish one). It was a magical feeling, that only comes with childhood, Christmas, or love.
Sad too to see them being phased out these days (Air France and Cathay Pacific recently), but if I'm lucky I will be flying a Lufthansa 747 back from Tokyo this upcoming March

But the truth is that I like all the manufacturers for different reasons, and it's a wonderful thing that there is such a healthy competition, keeping the variety alive & well.
I was going to list all my favorites, and write a novel or two about them, but then I see its nearly 03:30 AM and I better head to bed instead.
It's an interesting poll though, and I hope to see the results when more people will have voted. Thanks for having set it up!