I would say definitely closer to 3a based on the amount of root curl. 3a hair generally needs a good amount of length to really see the full ringlet pattern. The thing to keep in mind though is that curl pattern isn't really all that important. Have you determined your hair's properties (texture, porosity, etc) yet? Properties are what will help you find the best products to make your curls look their best. Livecurlylivefree.com has a ton of info for figuring out hair properties.

3a/f/iii
Modified CG since 11/5/11
CLEANSE: CJ Daily Fix, DevaCare No-Poo, CHS Treatment Shampoo
RO: SS Caitlin's Conditioner, CJ Beauticurls Strengthening
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier,Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel