1) Dylan O'Brien
This fairly new actor has recently launched his career with Teen Wolf. And has been sailing from there. With a Marvel movie under his belt, he could really go far.
2) Dave Franco
If you do not recognize his name, you will probably recognize his brother, James Franco. I personally prefer Dave. He has been in some really good movies and could definitely do a great job as Spiderman.
3) Taron Egerton
This English actor is new to the stage with only one movie, Kingsman: The Secret Service. But I think he could go far with Spiderman.
4) Donald Grover
This is the oldest actor on the list, at 31. But I put him on this list because he can do it. I am a fan of an African American actor, and I think he could do the best at it.