AS is less reactive and doesn't rust as easily but it is still a high carbon knive so you do have to take good care of it. AS takes a little more effort to sharpen, stays sharp a little longer and doesn't get quite as sharp but on both accounts, it is still very easy to sharp and gets incredibly sharp. I my experience once you have a good patina w#2 is very similar to AS. Kind of toss up for me. I really like w#2 and don't mind touching it up on a regular basis since it only takes a couple on minutes, literally.
I have a few of the inexpensive Tojiro w#2 knives also. They are a great value. Personally, I wouldn't buy a super low end single bevel. They tend to have uneven grinds and could take quite a bit of work to get them up to being used. If you are like me, I don't have a ton of experience with single bevel knives and the thought of doing major tuning is not appealing to me.
I would most likely buy a gesshin ukaru (w#2). It is a Yoshihiro that has been built to Jon's specs. He makes sure they are very well finished and stands behind them. Email him, he is a great guy to deal with. If you get it from him, have him do the finish sharpening.
If you are wanting to try out a AS blade, I fully recommend the Zakuri line. They are a fantastic value.