Thanks for the response on this
Rake is a surprisingly complex topic and they don't make it easy to understand. Also you have to look at rake caps etc. I will spend a bit of time to try have a comparison between the sites but it's only half the story. Reward schemes can help to offset rake but some reward schemes heavily favour those willing to put in huge volume and not the players who log in more casually.
Effective rake is the true measure and that's not really well publicised.
I think for now i'm leaning towards GG and then if things go well and want to play higher will have to reassess.