Rock Razor is surprisingly capable, even beyond what you might expect of it. I’ve ridden some pretty tasty stuff in sub optimal conditions, and ridden it out to tell the tale. BUT… That’s not to say something else might not have been more suitable.
I was a big proponent of mixing a Magic Mary up front with either a DHR2 or HR2 in 2.3 flavour out back (depending on preferences for rolling speed or more grip) for some time. I just never got on with the original Hans Dampf (slow rolling, lack of edge bite), the outgoing Nobby Nic was a bit fragile but also whilst it rolled well and had good climbing and braking traction, it was a bit too rounded and didn’t have particularly good edge bite. The updated Hans Dampf is much better than both, but not ideal for softer/loamier UK conditions where tyres with more pronounced edge bite (Magic Mary, HR2 etc.) seem to work better.
The Big Betty may have been a long wait for many of us, but I think it has been worth the wait. Loads faster rolling than a Mary (faster than a DHR2 too, probably as fast as HR2 I’d say), but very nearly as grippy. Braking grip is fantastic, edge bite better than all the others mentioned. It could have been a damp squib when you consider the last Big Bettys weren’t great, but thankfully we now have a matching rear tyre worthy of the Magic Mary on the front! 👍🏻