I have a B1/B2 visa on one of my passports. A few years ago I went to the United States on this visa and ended up overstaying for a few weeks (~20 days). I applied for an extension (form I-539) before the required departure date on my passport entry stamp, but never received a response (and I don't have any proof that the I-539 was sent, neither can I access the website anymore.)
Since then I became a citizen of a country that allows travel on the visa waiver program, and I plan on using that passport. The rules of the VWP say that you can't apply for it if you have violated the VWP rules before. I'm confused since it could be interpreted that I violated the rules of my previous visa by overstaying, but it was not the VWP.
Should I use VWP or try to get a new B2 visa?