I am shopping for an awning for my '85 Westy, and considering the Fiamma F45S.  I see the Bus Depot product attaches to the rain gutter while the GoWesty option bolts to the side panel.  Aside from differences in price, is there a difference between the two ways of attaching the awning in terms of strength and reliability?

Does anyone have experience with the Fiamma?

Thanks
Dave B.
Boise