Mine are mostly Spectrum, but that is only because I've have been able to a steal of a deal on them in the past. I find them to be quite durable due to the fact I have drop them numerous of times.
I don't have a Turnagiy so I can't give a fair opinion, but both makes are fairly poplar, so either choice would be good.
HL Panzer III | HL Tiger | HL Jagdpanther | HL Panther | Mato Sherman
Hooben Elefant | HL Pershing | HL Bergepanzer IV | Tamiya Leopard 1A | WSN T-34
HL "Golden" Pan-Tiger | M16 Halftrack | HL Panzer IV | Tamiya KV-1 | Tamiya Tiger