Compare Apple Watch products Apple Watch Series 5Apple Watch Series 3 Case Size40mm, 44mm38mm, 42mm Display Area759 sq mm or 977 sq mm display area563 sq mm or 740 sq mm display area Case Thickness10.7mm11.4mm Processor64-bit dual-core S5 processor; Up to 2x faster than S3 processorDual-core S3 processor