A fair enough question, I suppose, if we're discussing which programme we prefer - in the same way as discussing whether, for instance, one prefers Ever Decreasing Circles or One Foot in the Grave.
However, if we're looking at it from a "double act" point of view, we're surely not comparing like with like. Morecambe & Wise were a classic stage double act whose act transferred successfully to tv; the Two Ronnies were never a double act - they were just two comic actors who happened to do a series of programmes together.
If we want to compare like with like, the comparisons should surely be between Morecambe & Wise and, say, Mike & Bernie Winters, Little & Large or Cannon & Ball and between the Two Ronnies and, say, Terry Scott & June Whitfield or Tony Hancock & Sid James.