Ive owned a 2008 GS and then 4 GSA's, the last a new 62 plate TB
i dont see much difference in the triumph exp and new BMW TC in size or performance etc, as others have said the TC is a bit more sporting.
For me the planted bigger GSA is still the one for me, touring and handling it's still the daddy, i will try the new WC GSA when it comes out and assess it then.
BTW i hated the ride on the 1150 GSA horses for courses