More flap = more drag = reduced rate of climb
The important point here is 'what is required of the take off'
Short field....obstacles.....25 flap
It also of course depends on the runway surface. At the end of the day, do what it suggests in the POH, the manufacturers do know best (but DO 'factor' everything!)
JWF
[This message has been edited by juswonnafly (edited 09 June 2001).]