Meridiani has good advice.
I'd be wary of choosing a service because you percieve it to be easier. That's like someone choosing a wife for the simple reason that she likes him - never mind the fact that he is not attracted to her at all. Go for the service you want to be in.
If your sole deciding quality is that one particular service is easier to get into - and you choose that service, you probably won't be happy. Think about it - you won't be the only one like that - where is the pride?? You'll just have a bunch of grumbling co-workers counting down the days until their time is up. That is the last thing you want to have.
In my own experience with the Air Force (2 years of working with a recruiting office before I got smart and applied to the Marines) there is a complete lack of pride, no honesty, and most everyone is unhappy with their current situation. That may just be that recruiting office, I don't know - I just know I don't want to be a part of that...
To complete my ramblings, pick what you want, what you know you would enjoy, not what other people say is best for you or what seems to be the easiest route. Too many people in this world already have settled for what was easy, comfortable, and safe - don't be one of those casualties.