Dude, do whatever you want.
Some people seemed worried about not having every skill so I posted the solution. You are right that if you take rogue 1 instead of ranger 1 your math for "total additional points when rolling for skill checks" would be higher, but you still wont have all 18 skills.
I don't think having all 18 is that huge of a deal, not all will be super relevant and I wouldn't break my character to bend backwards to get every single one. Having plenty is important though.
