I only have Cubase LE which came with my Tascam interface.
I had a MIDI only version on my Atari so I go further back with Steinberg than Calkwalk. I bought Wave Lab 4? and Guitar Studio with my first PC.
in 2000, but continued using my Atari for MIDI because it worked perfectly every time.
I would try to make Guitar Studio work but because I was an idiot and was using a Sound Blaster Audigy of course it was always out of sync.
Wave Lab worked perfectly fine on that PC.
Of all the DAW software on the market somehow these two have been around a long time and are both more or less aimed at the home studio market. I think of them as Brother and Sister's. I like them both, both are as solid as can be expected for any software. Hey, MS Word has friggin glitches.
I am still using 8.5 because like many have said, why upgrade if what you have does everything you need.
But when the day does come that I am forced to purchase a new DAW I will find it hard to pick between the two products.
One of the deal breakers for me is that Cubase has wave editing built right in, no tool copy needed.
I have now invested 1,000's of hours in Sonar and only a few day's in Cubase. I still haven't come close to mastering it. But if changing to X2 ( X4) requires re-learning my DAW then this is another thing to consider.