With my Ion Obelisk 2 amp, my favourite Royds were Mk1 Sapphires - I had this set-up while living in Dubai, and it was sweet as a nut. So crisp & clear & fun. I've got Edens with that amp now, and while I still love the sound, it's not quite got the bouncy deftness the Sapphires had. The Sintras with it are great too, but again, I just loved the bounce factor I had on that system in Dubai.
With my Ion Obelisk 3/X-pak, my Sintras probably just about edged it, though the Edens were very close [as of course were my Mk1 Sapphires].
And for sheer thrill, my old Naim 32.5-160 into A7s was a bit in your face for some but awesome to me. I used to switch between those & my Neat Motives [I think they were called?] - more bass & sound from the Neats, but I preferred the simple thrill of the A7s.
I also really do like a pair of Minstrels I bought a year or two back - I've only ever had them plugged into a simple Pioneer amp for the TV, but they sound terrific.
In answer - for me, overall favourite is probably Mk1 Sapphires. But I love all Royds, for their amazing sound and also as someone else pointed out earlier, cos they're such amazing value for money [though I'm noticing their prices seem to be rising quite a lot again over the past year or two? I've never spent more than £75 or so on Royds I don't think, but I'm seeing them going for much more than that now - I bookmark every pair that comes up on ebay out of curiosity]
When / if we finally manage to get ourselves a slightly larger house, I'll be able to set my systems up properly again and switch things around. Currently most of my Royds are sadly on leave in the attic.