Which is better Function modules or Include programs?

Hi,
I am working on an enhancement and it has lot of screens with a tree structure on the left. Now we are planning to have each screen to have its PAI/PBO and the processing logic to be in seperate include programs.
However in our team we have debate as to go in for include programs or for Function modules. The opinion here is that the program should not take long time to load if its going to be include programs.
Please suggest what approach is better, is it Function modules or include programs.
Any other suggestion is also welcome.
Thank You,
SAC.

Thank You all.
In this enhancement I have about 13 screens and has business logic in each. So if I go with each screens and business logic coding in seperate Function modules than includes under 1 function group is adviceable?
Using object oriented approach is really the best thing here, but however most of my team members are not welversed in OO concepts. The deadlines are very tight for grooming my team members as well.
My only concern is that with so much screens and business logic in 1 transaction should not bring down this programs performance when its executed.
Any other suggestions to keep in mind for this is appreciated.
Thank You.
SAC

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>
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Which is better Function modules or Include programs?

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