M
mixduptransistor
You've gotten some great replies here. If we all had a crystal ball, these decisions would be a lot simpler.
I will chime in with one point: Not to be a moralistic old fuddy-duddy (which I may well be ) I wouldn't make the freedom to drink a six-pack-plus a high priority in the bigger scheme of things. Most likely, you will be able to enjoy a beer or two no matter what kind of valve device you get. Moderation is a good principle to practice in any event. (And I speak as one who, in college, practiced hardly any moderation at all. )
I'm afraid I've left the impression that being able to drink until I can't see is the motivating factor in my decision. First, I don't drink THAT much, but I do occasionally have more than "one or two". Second, it's far from the only thing I have under consideration, and is just one thing that is going into my complex proprietary algorithm for deciding what I want to do.
One reason I have asked about it, is because it's one of the things that I haven't found reliable information about. Some places say one drink will cause you to bleed from your pores, and other sites say you can drink until you pass out.