I worked with LiveCode a few years ago (it was called Revolution back then), adding features to an existing warehouse management system, and found it to be kind of a pain in the ass. It wasn't
terrible, but using it was not an experience I care to ever repeat.
What would you want to build with it? Based on the alternatives you list, I'm guessing you're looking to develop games or applications with a non-traditional user interface. If that's the case, then I suggest looking at QML & Qt Quick — it's a better and more productive platform than any of your listed options, IMO.
OTOH, if you're looking to develop platform-native-looking productivity apps for both desktop and mobile, none of these are especially good choices, but LiveCode might be the best of a bad lot. (QML would be better, except it currently doesn't look or feel native on mobile — that's supposed to change in the next release for Android, but for iOS it's going to continue to utterly suck for at least another 6-9 months, if I understand their development roadmap correctly.)
What would you want to build with it? Based on the alternatives you list, I'm guessing you're looking to develop games or applications with a non-traditional user interface. If that's the case, then I suggest looking at QML & Qt Quick — it's a better and more productive platform than any of your listed options, IMO.
OTOH, if you're looking to develop platform-native-looking productivity apps for both desktop and mobile, none of these are especially good choices, but LiveCode might be the best of a bad lot. (QML would be better, except it currently doesn't look or feel native on mobile — that's supposed to change in the next release for Android, but for iOS it's going to continue to utterly suck for at least another 6-9 months, if I understand their development roadmap correctly.)