Both previous answers provide a good description of the areas. However if you must have sidewalks and curbing then you do not want Arborlea. If however you like an eclectic mix of housing with mature landscaping then you do not want Penn's Grant. Your best bet is to contact a local agent for an area tour.
We live and work in the Yardley area and can help you find a neighborhood that meets your astehtic.
Fran and Mark Redding
Prudential Fox & Roach, Realtors
1010 Stony Hill Road
Yardley, PA 19067