I didn't have much luck with the NDA vanillas. I think their Tahitian Vanilla was the best of the 4 I tried but still faint. Overall, the NDA FOs were nice OOB but didn't do well in cp. The heat may have accelerated the FO morphing process but you would end up in the same place after few weeks even if you soaped cool. The alkaline pH is more the problem with vanilla.
The TCS VBN is the only vanilla that smelled like a decent vanilla to me after cp. Jules may have other suggestions since she tested more vanillas than I did.
Thank you. This was my first experience purchasing a fragrance oil. I got it to make a candle and was excited when I didn't get a headache from it. I was going to order a few more from NDA to try them in soap, so you saved me the time experimenting if they don't work well. : )