If you're tall, the height adjustable feature will be welcome and worth the extra money. However, if you are comfortable working (not sewing working, but kitchen working) on your kitchen counters and they are a standard height (measure them), then you probably won't need the height "adjustability".
I have a cutting table that is 37" in height. I thought I could extend it by lining it up with my dining room pub style table, but that is only 35.5 in height. Anyway, I'm 5'6" in stocking feet, add another 1.5 inches when in my sneakers (all the time I'm up), and am very comfortable with the 37" height.