There are a ton of different brands and products out there. With vegan powders, I think the main thing you will want to try to research is taste. I know it’s not the easiest thing to research. But some vegan powders have a grainy taste/texture some people will want to avoid.
Most manufacturers are pretty much aligned with quality ingredients (for the most part). If you’re just looking for something to add to smoothies and boost up your protein intake, they’re all pretty good. If you really really care about the full ingredient list, some of the higher priced supplements DO tend to contain a wider range of good ingredients.
This chart gives a good breakdown of cost per protein as well as a taste description of some best selling brands: