SMLG attributes Fav types difference between B & W

Hi all,

I am trying to find out which FAV type to be used in  SMLG for different logon groups

ex: cccGRP for interactive users with 6 app servers, cccBTC with 3 batch app servers  & cccRFC 4 apps for syncronous RFC communications

For Interactive users  & BTC we have fav type B [ Best performance ] and for RFC we have W [ Weighted round robin]

Are there any best practices SAP recommend which fav type can be used for different logon groups...

RZ12 what servers are  recommended to have for parallel_generators  group.? is it RFC dedicated server  group

Please suggest..

Thanks,

Subhash.G