A DR is 18 watts on a good day if it's healthy, but it's much louder than any Princeton which is 12 on a good day through a 10" speaker. Aside from the bigger transformers and much more clean power the cathodyne phase inverter of the PR has lower gain than the dual triode inverter of the DR.a deluxe (low 20s watt wise) is not much louder than a princeton reverb (around 18 watts). all that really equates to with the PI type and beefier iron is a minor increase in headroom. especially with the 12" and the cab it's mostly a timbral thing at that point. to me it's subtle enough that it doesn't make much sense to own both, just the one you like better (i prefer the PI type on the princeton, but to run it through a 12).
if you really do need more power, look at a vibrolux or a pro. basically the same as the DR preamp but with 6L6s and different iron for more power. the vibrolux is 2x10, the pro comes in both 1x15 and 2x12. the iron/voltages are different between them, and some people make a big stink about this, but in practical application it's probably not going to make as much of a difference to you as the speaker config and cab voicing.
keep in mind though those are LOUD. unless you have the opportunity to play loud unmic'ed stuff (like punk, DIY gigs), you're never going to be able to turn them up to grind. so if your PR is already doing it for you, i would suggest maybe getting a head cabinet for it, keeping the original combo cab as one speaker cab, and then getting another speaker cab (1x12, 2x12, 1x15, etc), maybe with higher efficiency/multiple speakers, to change things up.
I'd say a DR is also louder than the 63 Vibroverb through its original 'Oxford' speakers which aren't efficient. If you fit louder speakers like Emi Legends to this VV it can live with a stock DR easily but they can be muddy and middy IMO. They make a great jazz amp..
The 64 Vibroverb is a handwired single 15"which would kick the others to the kerb. I think the stock speaker on these was an Emi similar to a Legend, which is Emi's take on a EV. Massive transformers compared to the DR and 63 VV.