A 46-year-old man with end-stage renal disease due to diabetic nephropathy is evaluated as a living kidney donor for his brother. Preoperative CT angiography shows that both kidneys have single renal arteries with no anatomic variants. The transplant team prefers to procure the kidney that will maximize the ease and safety of vascular anastomosis in the recipient. Which kidney is most commonly selected for donor nephrectomy and what is the primary anatomic reason for this choice?