nylon will obviosly have a bit less slop.....bbbuuuuttttt..... metal gear servos are much stronger. i do not know of any nylon geared servos with as much torque.....plus they will strip if there is to much force over them....i went with all 5625's and 5945's in my showtime....130 oz/in and 185 oz/in....i think...they are definately overkill but at least will be usefull when i go to a bigger plane. they are digital super speed and didital mega torque or somethin...hitecs are awesome cuz their digitals are programmable...so i use them....so does RAMZ in his big 10cc extra 260. hes in our club and his plane flies awesome