Better when traders have more options no?
I'd prefer to keep them all, continuing with the choice of how we'd like to receive the rewards. The way the choice is offered could solve the problem for newbies... (like having advanced settings but having the default be only SP and STEEM.)
I think the default should be SP and SBD, as Steem Dollars are both more stable and easier to understand for noobs. It is only those of us who are here long enough to know the value of steem who would want to choose to be paid in Steem.
That would work ok for the default too.