Incorporate:

C-Corp.

You are planning to raise outside capital from a group of

investors, believe your company will grow to be a big business and

potentially go public one day, or you’d prefer to have all taxation

handled at the corporate level instead of passed thru to individual

shareholders including yourself.

LLC.

You expect your business to be smaller and not have as many

shareholders, and to raise little (if any) outside capital.  You do not

expect to go public but think it is more likely you will want to pay the

 profits made by the company out to shareholders on a regular basis.

Trademark 

Trademark app name