I'm sitting here with a pour of OWA and Weller 12 side by side for comparison and, after letting them sit for 20-30 minutes, I have to say the OWA has a sweeter caramel taste than the Weller 12. The Weller 12 has more wood overtones than the OWA and actually seems a little thinner. The reason for the side by side comparison was completely unrelated to the thread, but I thought I would throw my 2 cents in. Bourbon in general is known for a caramel like sweetness to some degree. Of course it can vary from brand to brand. Try them all! I have the ETL next on my list as well. Good luck with your hunt.
If anybody cares: the OWA is from circa 2009 bottling and the W12 is from 2011 I believe.