Friction vs Synfig Studio - Which one would be better for my requirements?

I use Kdenlive for video editing, but sometimes I also need to do better text animation, which isn't quite possible within Kdenlive. Also I find Kdenlive's Titler not so user friendly.

There's Glaxnimate for that but it seems too simple and UI not so good.

So I found Friction and Synfig Studio. They seem more detailed and seem to have more features. UI also look better. But I don't understand which one I should learn.

My requirements: Animating Texts (and sometimes 2D shapes) and use them in Kdenlive for my videos.

Which one do you recommend?