If you're just starting to cosplay then it can sometimes be hard to decide what kind of materials to use. Especially if this is your first time trying to craft a prop or armor. Some materials are expensive while others are inexpensive. I'm writing this to help you make a decision on worbla or foam. Check out my simple list of pro's and cons for EVA Foam, Craft Foam, and Worbla.
1) Let's start with the most expensive of the three, Worbla.
Worbla has some awesome benefits. For example you can heat it up and shape it to anything. You can place worbla over molds to take on shapes. You can also heat it up and roll it like you would play-doh to create accent pieces for armor. The best part about worbla? If you mess up you can heat it up and flatten it back to it's original shape. So, save every scrap piece because you can make use of them. It's also very durable, just don't leave it out in the sun/heat.
Sounds pretty awesome, but Worbla has a few cons. The biggest con is that it's expensive. If you're a cosplayer on a budget the prices makes it nearly impossible to use. Another downfall? You sometimes have to add fillers to it in order to achieve a smooth texture. And, then you need to sand it for evenness. Which leads to more spending...
2) EVA Foam
The cons of EVA? It's thick. Depending on what you're making it can be too thick. So, you may have to buy multiple sheets in varying thickness. To create some edges you may need power tools to achieve certain looks. You may also need to sand and saw the foam by hand. But, depending on your skill level that may not be an option yet.
3) Craft foam, the least expensive of the 3.
I hope you enjoyed my list of benefits and cons to these 3 awesome products. You can search for many different types of tutorials using different materials. Hopefully this was helpful in your decision of choosing materials for your upcoming cosplays. Don't be afraid to experiment and learn. Now, got forth and be awesome.