Domain aliasing and SEO [closed]

Question

I've had my photography site at photography.brianbattenfeld.com, but now it's becoming my primary income and I'm doing it pretty much full time so my primary domain should be my photography portfolio.

I'm thinking about having brianbattenfeldphotography.com and/or brianbattenfeld.com be my new domain for photography.

So my questions are:

• If I make brianbattenfeldphotography.com just an alias of photography.brianbattenfeld.com are there significant SEO or analytics issues I should be worried about?
• Will one perform better than the other, or rank higher?
• Does it make a difference which one people visit?
• Do search engines generally acknowledge the alias as 'secondary' somehow, because it's not where the files are actually stored?

A lot of questions I know, but I'm just trying to figure out what impact this may have.