Pros on stackable:
Can start another load while the 1st one is in dryer.
bigger washer capacity
I like that the dryer is "on top" making it easier to load and unload.
Cons on combo:
have to finish a load entirely before starting another
much longer drying time.
I'm going by the "cons" on what our friends that have one tell us.
I'm going by the "pros" on our Sears stackable that is still going strong after 16 years of fulltime use---jeez, I hope I didn't just jinx myself
I did look at a new Sears stackable and it did have a smaller tub. I can easily put in 16 items; shorts, tops etc and they are not all crammed in together.
My stackable is also a top loader which I like as I'm always finding one last item that I need to put in.
Hope this helps, Hugs, Di