Cigarettes are ridiculously more addictive. I know this from experience, but also from a study that found that MAOIs (in cigarettes, but not found in vapes) "dramatically increase the motivation to self-administer nicotine in rats."[1]
I had a wickedly difficult time quitting cigarettes, many failed attempts over the course of years. Vaping made quitting tobacco comically easy, and quitting vaping was also comically easy compared to cold turkey. To quit my all-day vaping habit I just...got rid of the vapes and stopped doing it. I thought about it a few times a day for the first few days, and that was it.
People saying to avoid vapes as a cessation tool are committing actual harm, imo. It's like the difference in difficulty between just jumping off a roof versus using a ladder to descend. Yes, ladders are risky, but not as risky as jumping off a roof.