Robot Damshii or Model Kit?

Hi.
So I was thinking of doing a female Seeker custom based on a GN Archer figure, inspired by the wonderful Shinobitron. However, I'm not sure whether to go for the Robot Damashii figure (which is prebuilt) or the 1/144 HG model kit (which looks to be more solid when assembled, have a better transformed mode, and is also more customizable thanks to being a model kit). Which would you recommend? I'm thinking of going with the model kit, but I need to confirm that that's the best idea.
So I was thinking of doing a female Seeker custom based on a GN Archer figure, inspired by the wonderful Shinobitron. However, I'm not sure whether to go for the Robot Damashii figure (which is prebuilt) or the 1/144 HG model kit (which looks to be more solid when assembled, have a better transformed mode, and is also more customizable thanks to being a model kit). Which would you recommend? I'm thinking of going with the model kit, but I need to confirm that that's the best idea.