I've been using Cakewalk since the DOS versions when it was practically the only game in town for PC sequencing. I subsequently upgraded to Home Studio 2002. My recent positive experience with SONAR LE prompted me to upgrade my Home Studio to full SONAR 5 Studio as I wanted access to the higher quality soft synths and VST EFX. Plus, SONAR LE proved to be very easy to use.
I basically have stuck with Cakewalk as each version has provided a legitimate and useful upgrade from the previous. I also have skipped the necessity of unlearning old terms / processes re-learning brand new software and consequently have remained productive as many elements are common and familiar as SONAR continues to develop.
If Cubase was better, it would only be marginally better for a short time before Cakewalk caught up again, plus I'd rather be a master of one platform as opposed to being marginally capable of using several platforms.