Looking back at last year, I saw decent improvements in FTP both from my Vo2 block (basically polarized) but also from my SS hill repeat block. But what both also had in common was doing some long rides with climbs in them. My 6 minute power also improved in both, but much more from the Vo2 block. My conclusion is - for most of us likely it does not really matter exactly how we train, but rather, just ride as much and as consistently as you can. If you have a specific event that you want to be in shape for, do a Vo2 block leading up to it to boost your short-term power.
Additionally, I saw some of the biggest improvements after rest. Even a full week with maybe just a single or no day of riding. And that matches with what both Seiler and Inigo san Millan have said. Although Jesse Coyle has said that he feels terrible the first couple of days of multi-day events if he tapers too hard. But personally for me, rest seems to bring the biggest adaptations.