Better should be dictated and defined by personal preferences, wants, needs, lifestyle, etc.; therefore consider revisiting the areas more than once, then determine where your comfort level will best be reached. Real estate professionals are prohibited from steering, enticing a buyer to purchase, or not, in specific neighborhoods.
Both are wonderful towns and have rail transportation as well as but for NYC commuters. Allendale has a charming downtown. Woodcliff Lake is closer to downtown Westwood. Both towns have great schools and provide good services.