I unfortunately missed the Stackable discount on their website last year, cause i bought Qubely here at AppSumo. In the meantime Qubely developers calmed down the development of their Plugin.
I gave Stackable free a new try then and was very pleased how it has improved over the last year. Creating sites feels a lot better than with Qubely.
Cause prices raised a lot i was a bit unhappy but than the AppSumo offer came to me.
Best timing ever ;)

Long terms short: if your work with Wordpress and Gutenberg: Stackable is the gold standard here at the moment. They develop very quick and V3 is in the pipeline. So for me as developer a no brainer to stack all 4 items.