I have a collection of Crello, Stencil, Tyle, and InVideo, and now PixTeller. The Stencil is getting the last place, and I'm not using it anymore. Crello has the most extensive templates library but no gradient colors. InVideo has an option of importing large video files up to 800MB, so you can make a nice long intro but only 1080p. However, for web projects, 1080p is perfect. Tyle is excellent for short video ads with your video background, music, and narrator.

And why I like PixTeller?
1) gradient colors
2) filters (border, skew, pixelate, saturation, etc.)
3) mask
4) image and shapes properties with width/high
5) save projects on your account, not like the Pixlr in the browser cache
6) animation timeline
7) animation export in multiple formats including webp
8) decrease/increase in animation speed
9) infinite loop or play once an export option

What is missing:
1) using video files at all
2) importing your video
2) exporting svg
3) more size units cm, mm or inches

PixTeller is more like a simple Photoshop with an Animation builder. Just add a video file support. PixTeller is an excellent product in this category worth to keep it.