Sonic by far is more popular.
Some people just prefer Shadow over Sonic.
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shadow of course!
amy likes sonic but when shadow kissed her life changed and cant decide anymore when did shadow kiss her
My best guess is yes, but I I'm not sure because of darkspine Sonic. I think shadow can, under the same conditions as Sonic. He hasn't had the same conditions, but I'm sure if he did he could turn into darkspine Shadow. Other than that, he can turn into more forms than Sonic.
It hasn't been confirmed yet by Sonic Team, so you'll have to wait, but it is more than likely that Sonic will eventually fall for Amy, as she is literally the only one who loves Sonic. It is impossible for Amy to marry Shadow, because if she were to grow up as an adult, Shadow will still have his teenage appearance as he is immortal.
It's pretty much up to your opinion. In most ways they are 'evenly matched' in the games, but in reality, Shadow technically is more powerful. Sonic just has speed going for him. Shadow on the other hand has: -Speed matching Sonic -Chaos Control *with only needing one chaos emerald mind you. Sonic can only do it when Super Sonic* -Chaos Control abilities like Chaos Spear, Chaos Blast, etc -Agility -And as far as we know Shadow doesn't run out of stamina as quickly as Sonic does. So again it's kinda up to you. They are 'evenly matched' in most ways, but Shadow does have more abilities end of story xP