I've noticed some traits in various tube line ups. I'm also suprised to see Mazda tubes from not that long ago demanding such prices.
Given my Exp, if those are the ONLY choices, I'd opt for the Mazdas. IMHO, they ain't the thriller killer diller tubes some call 'em, but they are nice sounding, and balanced across the bandwidth. My exp with the Mazdas and Teles were in the 6922 classes... USA and European, respectively.
If you're looking to amp up the presentations impact and resolution, seek out some Amperex replacements. heart body and soul. Amperex present it all. I use a mix myself though.. RCA and Amperex. I lean towards Tunsol too. I've lived happily for a while now with those 3 brands much of the time. Mazdas were similar to the RCA... nice. Balanced. Smooth. Decent little tubes. Reliable too.
I've found the vendor as, if not more, important than the proposed tubes.
Good luck.