The air gap is better but I don't think I would rush out and buy one just to replace an LD340.
It will be far from a life altering change. It's like twin sisters.... Let's say both are super hot..... but one is say... 5'-8" and 124 pounds and the other is 5'-8" and 127 pounds... Both will get the job done but I wouldn't make much of an effort to get one over the other.
