What do theas 2 do any way?
They both attempt to do the same thing, but in different ways. The main difference is in style and ideology. The Galactic Council is more autocratic, but in a democratic way. The Senate is closer to democracy, only in a tyrannical sense.
Whereas they both try to perform to a specific level of precision, only the Senate has been able to (so far) take a more proactive approach to the task at hand, albeit a temporary gain through the delegation of leadership. The major undertaking has been recently eclipsed by a general election that might affect both endeavors to some degree but both should, in theory anyway, continue along a similar path.
The latest accomplishments within each group will probably spur even more attention to various efforts as history judges the final result from the point of view of those who might have witnessed the process as it unfolded.
I hope this helps.