I wouldn't recommend either servo for a 60 size heli. The 9001 is a much better servo than the 3001. I wouldn't use the 3001 in any heli. I had a set of 9001's in my caliber 30 and they did just fine. I changed them out and replaced them with 9202's when I had the extra cash. They are now in my Hawk Sport and working fine. 9202's are the minimum I would use in a 60 size heli. For reference, the 9001 is a coreless motor servo and the 3001 has a standard three pole motor.
Later,,,basmntdweller

IF you are in the market, some of the heli mail order places will put together a complete radio system with the RX and servos that you want so you aren't buying stuff you won't be using.
Tower hasn't been real happy to do this in the past.