EL 34

I have recently had the urge to stock on NOS tubes to tide me over in the future given the growing scarcity of NOS.
I favor the sounds of the EL34 but do not have the funds to purchase Mullard NOS.
So, my question is what is the next best midrange sound in NOS EL34?
Siemens ( and if so what era ) vs Tesla vs Amperex?  Any others to consider?
Thanks
MP