"Adjustable" can mean two things.An adjustable seems like the logical choice here
First, there are the vintage and modern adjustables that you can adjust on-the-fly, and then there are 3-piece razors with multiple plates, where you can adjust the experience by unscrewing the handle and fitting a different plate.
I'm a fan of the multiple plates option, because you get the simplicity, reliability and firmly held-down blade of the non-adjustable, plus the option to try different blade gaps.
I have not tried the AS-D2, but since it is a premium product, give it a fair try, learn its ways, and if it works for you, "enjoy".
If you still don't like it after about 6 weeks, then it should be very easy to sell, for at least enough money to try a Rockwell 6S.