I am quite sleepy so may have missed something but Alpine Grey with a black/grey interior should be ok in appearance, in fact is the ONLY option in configurator in UK for example for AMG trim version perhaps as less striking interiors help the sporty driver focus on the outside more? UK luxury version also has a "balao brown" optional but still with black steering wheel (attached).
I understand that black/grey does have some contrast between the black and the grey that might not be easily seen in photos especially on computer screen configurator. I think some versions have contrasting red stich too (mandatory in UK non-luxury version in configurator it seems)
I imagine black/grey probably looks better if scuffs / wet shoes etc will happen more often or not maintained according to manual regularly, else in the probably rarer beige the carpets can be switched afterwards
I understand that black/grey does have some contrast between the black and the grey that might not be easily seen in photos especially on computer screen configurator. I think some versions have contrasting red stich too (mandatory in UK non-luxury version in configurator it seems)
I imagine black/grey probably looks better if scuffs / wet shoes etc will happen more often or not maintained according to manual regularly, else in the probably rarer beige the carpets can be switched afterwards