What apps to use for crerating vector drawings on iPad?

I'm a signmaker / graphic designer who needs to create vector drawings on DRAW X7 and just picked up an iPad pro and Apple Pencil which I am trying to integrate into my tool/skill arsenal. So far I have only tried 2 apps but neither seem to be making vector paths (Adobe Draw and Adobe Sketch). I am finding them awesome for sketching but clunky in how it seems to be able to only save my creations as .png format which I've only been able to get into Corel by saving to something called AdobeCC (creative cloud) then downloading onto the ipad so I can ultimately email them to myself. I gather that if one was using actual Adobe Illustrator the files on CC would be importable as editable vectors, but I'm a Corel guy so what's my workaround(s)? 

Thanks!