I've stayed at the GF RPC and BWI CL and I far prefered BWI

(although GF was of course still very nice).
The evening food offerings at the BWI are more what I would call 'substantial' and included (when I was there in May) chilli, pulled pork, fish and rice (very tasty), beef skewers, chicken skewers, prawn skewers, chowder. Re. the skewers they were 'full size' as opposed to the more canapes size at the GF, the hot food items were served in large containers and you just filleld your own bowl/plate, rather than the 'cute' little individual plates at the GF. In addition there were 'cold' items each evening, various cheeses with crudites, pitta bread with dips including hummus.
Breakfast usually consisted of 3-4 cereals, bagels, pastries, fresh fruit (melon, pineapple), yoghurt - bread was also available upon request.
Unlike the GF there is no champagne but we enjoyed the wines on offer. BWI had the most delicious chocolate covered strawberries every evening, along with other little deserts.
BWI does not have afternoon tea but they have snack items out such as popcorn and cookies. However, the evening pastries/deserts were lovely.
I much preferred the BWI evening food offerings over the GF.