I want to further my career in biotechnology with a PhD. I've applied to a number of programs including a standard Molecular Cell Biology program as well as an Engineering program in the same school; the latter has a number of faculty who work in biotechnology and I could work in these labs through either program. I already have a Masters in Cell Biology, so I already have good training MCB-wise (and know what to expect from MCB programs). What are the downsides and upsides of Engineering programs?