After trying various new production and NOS varieties, I've found cryogenically treated Gold Lions from Cryoset to work extremely well. They are very even in frequency response and last what seems like forever.
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I use amperex bugle boy primarily or its Philips and valvo variations. The German valvo are equally good. Also When
i roll them it with a tungsrum that is very nice. Both seem to me very balance presentation. Mullard and clear tops are also very good depending on your tastes and equipment. I have tried the telefunken but for me they are a cold sound. Have not tried modern types as I have a lifetime stash of nos. The candela is one of those animals that is very balanced and allows for a wide variety of tubes to experiment with.