From a purely financial point of view I'd say Sunderland , they pack the away end so financially that's better for the reds , but I'd like Donny because I know they ll struggle next year .
They should but it doesn’t always work like that. I know a Charlton supporter and he isn’t confident. They apparently have a very poor playoff record. They deserve it though finished 3rd and in great form at the season end
They are definitely a lottery and as such can be inherently unfair. Charlton seem to be in the best form, which isn't going to guarantee anything but I think will carry them through. But yes if I was a Charlton fan I wouldn't be confident of winning them either.
I would say some advantage to Portsmouth if they reach Wembley, having won there already this season.