This isn't proven, but it is possible. I believe so many people are desperate for a "better" vaccine that they're jumping on the possibility.

Novavax includes an adjuvant intended to promote affinity maturation. If such an adjuvant worked it would certainly give broader immunity over a period of multiple doses. mRNA vaccines do not include any adjuvants, and I don't think vectored do either - likely because these are new technologies - but most vaccines do have them. Novavax's is supposedly one they just made themselves and they are extremely cutting-edge in tech so it's possible it's something no other vaccine has. But unproven. Oddly this is something you'd also want to take (as a supplement or whatever) during recovery from infection if it did work.

But the data itself does not at all prove that Novavax is better, broader, or longer-lasting than moderna. It does pretty clearly support that Moderna and Novavax are better than pfizer. Here "better" means "more antibodies", but if those are also accompanied by more side effects that's not necessarily actually an improvement for the general public. Most people on this sub and the covid-zero ones are not the general public though.

Quick example, compare this moderna data vs the novavax data. On paper it's a 3.5x dropoff for Novavax vs a 5x dropoff for Moderna vs BA.5 in those with previous infection. But these are different studies and cannot be directly compared like that, because the accuracy of the "fake" virus being used for the tests has a large effect on the results. There can also be a difference in the groups themselves - people who got Novavax in these trials are without exception those who got Novavax for their first dose, and since novavax wasn't available for months after moderna it basically means they didn't think they needed to be vaccinated ASAP because they were healthy and didn't fear covid. Or moderna could just be making more antibodies across the board.

There are a lot of studies comparing novavax to pfizer, but many fewer comparing it to moderna. I have noticed a disturbing trend that the ones done by novavax themselves make it look a lot better than the independent ones, but this is hard to pin down.

There's probably a good chance the adjuvant is effective, but that still doesn't mean "more antibodies, longer lasting, better against variants" in the way you might think. Antibodies are still going to wane at around the same rate, such that making 2x or 10x more gives you an extra months or years before you wane back down to original levels. And "better against variants" if it's caused by affinity maturation is specifically after the next dose. In the novavax data this is explicit - it's not after one novavax dose, it's after all doses so far being novavax. But practically what it would mean is a novavax XBB booster this year might give you more immunity when you get your BA.2.86 (or whatever) booster next year.

There are other reasons to get novavax. It makes a lot of antibodies, there's no doubt about that. If it's "as good as" moderna (and it's certainly in the same ballpark), that is top tier. And as a non-mRNA vaccine it sidesteps any concerns younger people might have about getting mRNA doses every single year, something we won't have long-term research on for a while still.