I@m trying to compare the two but it's doing my head in. They cost the same price and save the same amount of money but I can't work out which is best. Only the Network Railcard lets you travel without children, is that right? Does anybody know if they are valid on the same trains?
I hadn't heard of the Network Railcard before reading your post so just googled it. The key difference that I can see is that the NR is only valid on trains in the south-east, so you can't go any further north than Bedford. It seems to have similar peak time restrictions.
The F&F railcard is valid on all journeys in the UK apart from first class bookings & peak times in the south east.
It does look like you can use the NR by yourself, I couldn't find anything about minimum group. The F&F has to be one adult & one child, I think.