The R93 and R8 are different enough that there are no interchangeable parts; a sore point for owners of the older R93, since barrels for the R8 do not fit. The basic design is certainly unchanged, and remains unique and distinct from all competitors.
And, certainly, the appeal of these guns is magnified for those whose governments have decreed they can only own a certain specified number of firearms. We're not there...yet...but there are other reasons that Blaser fans are convinced their guns are "better"...whatever that means.
My R93's (and also the R8's) can be taken down and re-assembled with no perceptible loss of zero. That includes removing and replacing the scope, barrel and bolt head assembly. They do this "better" than anything else I've tried. The triggers are as good as any factory trigger I've ever felt and "better" than most. They are shorter than any other repeating firearms with equal barrel lengths, though not quite as short as a single-shot. The straight pull bolt is faster than a standard turnbolt action; no matter how fast your skill level allows you to cycle a standard bolt, there is no denying that the same amount of practice will allow you to be faster with a straight-pull. The accuracy of Blaser barrels is usually outstanding. Their literature indicates that the metallurgy and finishing processes used will result in hugely increased barrel life; I can't speak to this one yet but when I corral a barrel in .308 the attempts to wear it out will begin.
Oh...let's not forget the de-cocking "safety". When the gun is on Safe, there is no tension on the firing pin spring; a round can be carried in the chamber with no danger. Dis-engaging the "safety" is actually cocking that spring and placing the gun into a state of readiness to fire. No silliness about hammer-blocking or trigger-blocking or transfer bars; when the gun is on Safe it is completely safe, uncocked and unable to fire.
What other system gives you this combination of features? The Merkel Helix sounds like it does, and adds the minor but enticing carrot of tool-free disassembly (the Blaser needs a hex key). It's been out for a few years now; I wonder how it's sales numbers look? If I were in the market today to enter into ownership of one of these systems, I'd probably go with the Merkel...or maybe not.
So...are they better? Well...yeah, I think they are. If I didn't think they were worth the money, I would have spent the money on a few other guns. After a few years of playing with them, I might have decided they were all hype, not worth the money, over-rated; if I had come to that conclusion, I would have sold them without hesitation. I didn't, and have no intention of doing so, because I still think they represent outstanding value for money. It's funny when others say that they could have spent the same money on an assortment of other rifles that do the same things; the way I see it, that's a bad thing, not a good one.