This is purely based on observation since fielding stats fail to accurately guage an outfielder with a great arm. They fail to measure players that don't attempt to run on these guys. One thing I've always loved seeing are guys gunning down would advancing baserunners. Visions of Clemente, Winfield, O'Neill, Whiten, & Mondesi nailing guys from the OF fence at 3B or Home amaze me because so few people can do it. Something to consider, is the best arm the arm that propels a ball like a cannon or an arm that seems more like a sniper rife with its accuracy?
So, who has the best arm in the majors now?
Also, please mention who is quickly becoming a force with their arm?