Valve owners normally go for super sensitive models, 93db or more. This has pushed the prices of old super efficient Japanese speakers right up.
Pretty much all those speakers you list will have been designed for big transistor amplification. The Missions are happy on 250W plus amps whereas they are underpowered at less the 80w. Its not the volume, just big transformers to supply lots of current.
Theres no 'better' or 'worse' than either - it what your own ears perceive. Some designs are more forward sounding because there is more information sent to the tweeters at the crossover. Some designs sound muddy and laid back but rarely does age kill a speaker other than the form surrounds. These deteriorate as most of you will know. Flappy speakers leave you wondering why until the cover comes of to reveal powder in place of foam!
So 'old' speakers can easily be revived by either fixing the drivers and/ or replacing the components in the cross-overs. This can benefit more than most snake oil solutions - fact!
Back to your amp - Try a set of Leak sandwich while they are still cheap. They are fun and can produce monster bass. They are quite detailed despite being 40+ year old design.
Look out for the huge easy to drive Japanese multi tweeter behemoths from Sansui, Pioneer and Kenwood/ Trio. They may look a nightmare but given a few updates to the x-over, again, fun.
More recent, by 'recent' I'm talking 1980/90s, try JBL. Their models can be very sensitive and go well with valve
Funny because as I write this, I've go my Quad 33/303/FM3 warming up ready for a trial run along with the Lecson.