I've had both Skywatcher and Celestron Alt-Az go to mounts. My Nexstar mount had to go back twice for replacements; a power board and then a motor. The Skywatcher is still going, but had a lot less use.
The major difference for me in the software, was that the Celestron could be set to tour all the objects in a constellation. You could, say align it and send it to go to all the Messier and NGC objects in Virgo. For me, it gave me the chance to focus on a constellation at a time. The Skywatcher can tour the skies, but not by constellation, it would do its own thing!
There's also one significant advantage to the Celestron, in that you can align it just on the moon, and then send it to a planet that was up. More than once at Seething during group visits, I've aligned on the moon and then showed visitors Saturn r Jupiter through the eyepiece, despite them being lost to the evening sky.
Not sure how good the importers of Skywatcher are, but Hinds, who look after Celestron were utterly c**p. I'll never, ever, buy anything that they import again. Thankfully FLO sorted it all out for me. 3 years I've had my Tak, but still rate the 5SE as a great scope.
Good luck.
Chris