Personally, I was baptized Orthodox as an infant, but did not really practice till later in life. When I began to look into Christianity seriously, I also had trouble understanding the many churches available. The hardest part was actually weighing Roman Catholicism against Orthodoxy. The two look very similar at first look, but if you look into their history, it becomes clear that initially there was only one Ancient Church, and The RC broke away from that ancient church and over time became something very different than what the ancient church was meant to be, and remained in the form of The Orthodox Church. There are other logical reasons such as Christ promising to defend His one church, etc. However, I don't find that logical arguments can cover the entire reason why I decided to go with Orthodoxy, though they are important (I can't pretend they're not there). Part of the reason is also that I find God and myself in Orthodoxy, that I believe in what it is practicing. Nowadays, I can say that it really works, that I am very happy for my decision; but this is deeply personal stuff. I cannot offer it as logical argumentation, but only as my own testimony. Ultimately, though, I believe our deep feelings do play a great role and they should, for all of us.
P.S. And, regarding clergy, yes, it is all different. We believe that Christ is leading our Church through The Grace of The Holy Spirit. Even though, there is a hierarchy, we are all equals. The RC has the pope as the infallible vicar of Christ, which is a very serious error, and this and other things limits greatly what The Grace of The Holy Spirit can accomplish.