What the hell should I do?

I'm a f2p and I've been saving my pulls (still don't have many). With the upcoming characters and the reruns I've been wondering who I should pull for. I'm planning to skip Anby and Trigger, and I've already got Burnice. Now the real question; how important is her W-Engine? Because if I dont really have to get it I'd like to save for Jane Doe. I'm using Rainforest Gourmet on Burnice at the moment, and maybe further saving my pulls could get me Jane with her W-Engine. Should I pull for Burnices Engine or save for Jane?