Choosing between 2 girlies?

I've been dating someone for about 6 months, we argue sometimes, i feel like she doesn't prioritize me over a lot of things, such as her friends. I met this second girl a month or two ago, and first off she is a lot hotter. And to be perfectly honest she seems to uh. Get a little naughty? ( As far as I know she isn't a whore). When I look at the second girl it makes me wonder if I deserve a better looking girlfriend, although girl #1 gets me, she understands me and she can forgive me easily. I know the answer seems really obvious, but it isn't to me lol.