Generally from my experience whatever the design is made in is what you'll need to edit it properly.
That said, you can usually get away with editing individual assets if they're output in the right format. SVG is one of those formats that usually travels pretty well between different apps because it's all just XML data.
But if you want to edit PSD or AI files hassle free, you'll need to use Photoshop/Illustrator which means you need to pony up some cash.
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Generally from my experience whatever the design is made in is what you'll need to edit it properly.
That said, you can usually get away with editing individual assets if they're output in the right format. SVG is one of those formats that usually travels pretty well between different apps because it's all just XML data.
But if you want to edit PSD or AI files hassle free, you'll need to use Photoshop/Illustrator which means you need to pony up some cash.