Honestly, I like more rubber ones. Why? Because rubber ones somewhat softens sharp and quick lever pressing and thus wheel locking is less likely possible in extreme situation. Stock single rotor brakes on TA are somewhat weak and SS lines allows press to them harder and thus getting feeling of improvement, but I think, this is not right way- proper brakes should work perfect with any type of lines. So, that's why I din't upgrade brake lines, but I upgraded to 296mm rotor and SLR650 Brembo caliper. Now even with stock rubber brake line brakes are perfectly adequate.