Zurich to Lugano - Gotthard or San Bernadino

[SydneyP]

Driving from Luxembourg to Lugano so don't really have time to loop back and do both.

Is one worth doing more than the other?

[SydneyP]

Change of plan now staying in the mountains. So starting in Adelboden... current plan is

Adelboden - Interlaken - Grimsel Pass - Nufenen Pass - back down St Gotthard Tunnel - St Gotthard Pass - then onto Lugano - Siena

Thoughts?