Need help...what position is better to add: rb/wr or wr/te

[moochman]

I really think if you are looking to add a flex, it should be RB/WR/TE and you should add at least 1/2 PPR. The point per reception helps to equalize the affects of having 3 solid RBs by giving some RBs and lots of WRs more value. In really big leagues I even like to have indiviual return yardage count, 20 yds per point.
I also think more liberal scoring rules helps to encourage participation in the waiver wire and increase recoverablity should you Mooch* a draft.

*Draft a Selvin Young in the third round, for example.

[spodog]

In all the leagues that I am in with a flex, it is usually RB/WR/TE

YEP. Why artificially restrict an owner's decision by dictating what the flex is? Let it be RB/WR/TE and let each owner decide who they plug into the FLEX from those spots each week.