Yeah, one-way go with the flow for me (well to a certain extent).
First time solo traveller too, I'm heading to Thailand for a month then onto Oz on a one way ticket in October. I think it will add to the adventure and give a lot more freedom as to when and where I want to go next.
If your on a RTW ticket you might fall in love with a place which you have to leave behind when you didn't want to. They are usually limited to 12 months and one direction too so hopping back and forth is usually a no go! In my opinion the price is the only benefit of a RTW.