I have two field of thoughts on kit vs ARF.
ARF
1.) I'm NOT an ARF fan, BUT, they do have a place in the hobby.
2.) ARF's are usually built straight, though not always well constructed. Most require "beefing up".
3.) Most ARF's come with complete hardware packages, again, not always the best hardware.
4.) You are more likely to learn quicker on an ARF because there isn't the sentimental attachment to it that you will have for a kit built plane. You are more willin to put the plane at risk. Not many tears are shed when an ARF goes in the dirt!
5.) You can be in the air with an ARF in a very short time, compared to building.
6.) ARF's are relatively cheap.
7.) Most ARF's fly well, but ask people before buying one to be sure which are better.
Built-up
1.) Building is a fun part of the hobby, that is if you like to build.
2.) When you build, you know exactly what is inside the plane and how it was constructed.
3.) Here's a biggie...pride of accomplishment! I love flying what I build. I'm proud of my workmanship.
4.) Kit built planes last longer than ARF's, they are constructed with TLC, not in a sweat shop!
5.) You can repair a kit plane much easier than an ARF. You have the plans to work from.
6.) Nothing worse than walking out to your plane that YOU built with a trash bag in hand....LOL.
Final thoughts? Ok. Getting an ARF for a first plane will get you in the air and you can be flying NOW! While you are learning on the ARF, you can be building that special plane that you will enjoy flying and take your time building it. You can have the best of both worlds!
Just my humble opinion,
Rod