We cannot comment on costs yet, too many unknowns, but Im almost positive with my low overheads your overall returns will be better with us than with anyone else. Final fees will be released when all baking criteria is fully known from the devs.
It does appear that when you delegate, you also delegate your vote. but its not known yet if this means that a delegate then gains multiple votes where the delegate can cast different votes different ways , or if the delegate then gets a single vote that is weighted higher with more delegation.
so really, just too many unknowns at this point