Not so much that, given that F&B wise, it seems that the Business and Senator are pretty much the same. Seems the main advantage of Senator is it is a bit quieter and cleaner.

What I was thinking of was more along how crowded the lounges are (UC always seems to be swamped), preference for tarmac views, and/or food types (SKL slanting more Asian, though again there seems to be some commonality across lounges for some of the food items).