I'm just curious, are they just the same?
Not really. but there are some coins that works that way such as ICONOMI. those coins that supplies are limited especially to 100M only such as wavesplatform.
stocks can be risky if you don't have inside information to companies you invest with.
I never heard that iconomi was limited supplies.. so they will never generate new coins in the future and it will stay at that amount?
Unlike bitcoin that always farming bitcoins or mining to generate bitcoins that we can use.