读尽量多的书是 I want to read books as much as possible 还是 as many as possible

读尽量多的书是 I want to read books as much as possible 还是 as many as possible

后者
因为书可数
此句还可改为：
I want to read as many books as possible
I want to read as many books as I can

用as many as possible

much！
much修饰动词read，many只能修饰名词