seize强调捉住,握住这个动作本身to take sb/sth in your hand suddenly and using force
catch强调使物体停止运动to stop and hold a moving object, especially in your hands,这就是为什么说catch a ball
比较这两者的意思,seize the chance比较合适.
seize还有控制局势的意思They seized the airport in a surprise attack.