For germanium shoot for Q1 HFE 80, Q2 hfe 120, leakage below 100uA. Bias Q1c to 0.7V, Q2c to 4.5V (those will be negative if you use PNP) and adjust by ear.
I've had good results with AY33-AY34s but that is what I have available to me. Part number is not important.
For silicon you can use both...