If we use PNG – for iOS we use @ x1 @ x2 @ x3 size per image (which in Zeplin / Sketch is just a click). Android – about 5 image sizes, so we need to manage 8 PNG images per graphic element.
while SVG – will work for iOS and Android, but there are technical limitations. For example, the SVGs are distorted during rendering. We may be able to fix the problem by sketching the individual SVG elements / layers.
I hope someone can help us find the best format for our app.